When is it typically recommended to PvP? I'm level 8 and a huge scrub, but I don't like bots.
and while I'm here, any suggested builds/tips for Twitch/Mordekaiser?
I only got to use Morde for a day [The first day I played, at that.] but he seemed pretty cool, and I have enough to buy him now.
I looked up builds for Twitch on the LoL site, but my friend says they're not very good/don't have the right priorities early on. :x
Don't buy attack speed early on with twitch, it'll just cripple your damage buildup and you'll be useless through a good deal of the game if you do that. Twitch needs attack damage and armor penetration, don't buy pure attack speed/lifesteal on him, you get those with your AD items, attack speed twitch is NOT a good build ever since they nerfed his ultimate (this ulti was duration based rather then shot based as it is now), and to be honest it wasn't good before that either. What I do is build me a long sword and a health pot, followed by zerk boots (mobility boots are def not a good choice if you're starting with twitch, and buying mobility boots on him is basicaly screaming "HEY ENEMY TEAM, YOU SHOULD REALLY BUY SOME WARDS, ORACLES AND FOCUS ME NOW", since they only use is to get in position to gank faster) and another longsword which will become a brutalizer (which you won't build into a ghostblade, at least not now), then if you played twitch properly and ganked like a boss, you should get yourself a black cleaver now (zerk boots and black cleaver are the only attack speed items you'll be using) which is awesome on twitch, then follow up with infinity edge and bloodthirster, on the order of your preference, I prefer infinity edge first. At this moment your damage will be pretty high, and you should you can now work on some lifestealing, which combined with your ultimate and the massive crits you should be pulling off now should allow you not only to survive teamfights, but use your ultimate to wipe out most (or even all) of the enemy team.
Just one thing about twitch: If the enemy team as a smart tank and your team happens to have none, you're going to have to play alot more defensively. Due to all the armor pen twitch should handle tanks reasonably well but a good one can ruin your day if your team can't keep him down for a few seconds while you exterminate his teamates. Avoid playing twitch on teams with no tanks. Use this to your advantage aswell though, if the enemy team has no tanks, knock yourself out punishing their squishies, specialy those that don't have stuns.
Know your role on your team. As twitch you have only one possible role, which is being an assassin. Using twitch as a scout is an easy way to get yourself killed by people with more then 2 working neurons, as they'll be using pink wards/oracles. Its unlikely they'll buy those in the early game unless they're really afraid of you though, so use that to your advantage. Once you get some items going on and level 6, go around and start ganking a bit. If the enemy mid happens to be at 75% health or lower, its your cue to gank him/her, just remember that mid is the lane that is most obviously going to get ganked and since its a solo lane, there's a decent chance it may be warded, try to ask your mid if it is before trying a gank then. Non-solo lanes are also good places to gank, just make sure at least one of the enemy champs isn't at full health and warn your teamates you're going to gank, so they let them dive into the lane a bit, then you shoot them from behind while your teamates fall on them. HOWEVER, if you're going to gank people with hard CC (taric, sion) you should at least try to wait for them to use it before you start attacking, that CC can ruin the whole gank and get you killed if they think fast enough hand focus you.
A good twitch is a fed twitch, if he isn't countered he becomes a massively powerful carry, but nigh useless if played wrong.
Tanks should be the main factor behind your decision to use or not use twitch. You need at least one tank unless you're really confident on your skills. I'm talking about real tanks, not tanky DPS.
As for spells, I usualy pick Q first, since its what make twitch be twitch apart from his ultimate, pick E second but please, don't be like the multitude of bad people playing twitch and rely on E for damage. E is what you use to finish people with low health and SOMETIMES to harass if you happen to have taken mid lane and have mana to spare, but chances are you won't. Don't be a bad twitch, don't get mana items, and leave blue buff for your mages, if you need mana you go back to base, and don't spam E unless you wanna get starved for mana. W is what you pick next as its an awesome slow that will net you many kills and even save your rat ass a few times, your choice wheter to max it or E first, just make sure to pick at least some levels in both, as both are essential to make people rage about you. Your R is priority whenever its availiable, as it is an awesome ultimate that gives you attack speed, damage and turns your bolts into deadly harpoons that will go through anything it hits. You have a limited number of shots but good use of your R can win teamfights and get you multiple double/triple kills in a game, just make sure you have alot of damage and a fair bit of criticals, as one crit with a shot from R will crit on everything it hits, and it will also apply every on-hit effect you have, lifesteal for every target hit and apply poison to everything to boot.
TL;DR: Don't stack attack speed, avoid playing without a tank, gank people like a boss.