If you installed with Pando Media Booster, make sure to uninstall it after the game is installed; it's unnecessary and continues to donate your bandwidth for the profit of a corporation, seemingly even after it's been shut down. Also I recommend using Steam to download the game as it's better in every way. A way to bypass either is to restore your computer to a previous backup and retain the Turbine folder from previously. You'll have to allow administrative privilege to three things, dndlauncher.exe, dndclient.exe, and turbineinvoker. In addition you'll have to use TurbineRegisterGDF before you try to launch. Fail to do any of these and it won't work.
Something to consider doing to maximize the exp you can gain is to hold off on leveling up immediately. You can 'bank' some experience up to what it requires for the next level up past what you can level up to now, -1 experience. That means if you are level 4, you can earn up to level 6 -1 experience. In this way you'll still be in the level range requirements for level 4 quests. When you level up, you'll be one point from 6, at which point you can then earn enough for 7 -1exp.
Also you'll probably want to pop up more hotbars (the arrow on the hotbar to the left or top depending if it's vertical or horizontal.) I have 5 or 6 so I can put equipment switches on the extra hotbars and put them at the top of the screen. I also use a potions hotbar vertically on the right. Finally I have two or three at the bottom with skills and abilities.
Remember to log out and then back in after popping up any number of new hotbars. There is a long standing bug that will screw up which is the primary (which uses 1-0 on the keyboard.) If you don't relog you might end up putting what you want using the 1-0 on the wrong hotbar, which will change when you log in next time.
Also it seems to happen rarely without opening a new hotbar so if you notice your number keys firing on the wrong hotbar, a relog will fix it.
As for airships, you can use a group member's with a higher level airship. You do this by standing in the entrance to the airship, like you were about to click to enter. Then you ask your group for someone with a high level airship to invite you. Once they do that you'll get a popup asking if you want to enter their airship. Once you accept you'll be able to use their airship buffs. I recommend doing this as often as possible, especially if your group hasn't entered the quest yet and is in the preparation phase. Airship buffs can easily mean the difference between taking no damage or being killed by a kobold shaman's lightning bolt when you are on elite in most of the low level quests for example. If that wasn't enough the higher level guilds will usually have an airship buff that gives a small percentage increase to experience gain after a quest complete.
Speaking of percentage bonus to exp, something that is often bypassed by people who are only farming favor for turbine points is breaking all the breakables you can. It annoys me when I'm the only one breaking stuff because the percentage increase is substantial. It really doesn't take much longer but the farmers are always in such a rush to complete that they often ignore them completely, to my detriment as someone who wants the exp. It's usually at the lower levels that this happens, and the argument can be made that the overall exp lost isn't substantial. However I say that I'll take a 15% decrease in the time it takes to level up anytime, so I stay back and break boxes if necessary, even if the rest of the group rushes ahead.
Remember that you can sell +2 equipment in the marketplace just north of the zone to harbor for slightly more than you can to a barkeep for example. These are the blue coins on the map. For higher level stuff, there are pawnbrokers in House K (for armor) House D (for weapons) and high level jewelry is in the same place you can sell +2s in the marketplace. Clothing I can't recall which zone. If you can't find something affordable on the auctionhouse, you might want to check the appropriate pawn broker as they are usually well stocked. Selling at these places is recommended if you don't have more than the 1 slot available on the auctionhouse for free players.
Also when selling your loot or purchasing something costly from NPCs be sure to equip an item with +haggling skill. It will improve your sell and buying price, but not what it costs to repair.
Finally send a mailbox message to Naivuud once you make it to the Harbor. I'll send you 1k plat in a message for you to use. I have like 180k and I can pay up to 600 plats to repair my equipment after a quest with a lot of deaths so it's no big deal, but it'll keep you supplied with ammo and potions for the low levels.
You can 'link' items in chat by opening your chat like you were about to type something, and then control+right clicking on the item's icon in your inventory. It will show up as a white text link that can be clicked on to examine the item after you send the message. For example to show your guild something, enter > /g Check this out: (control right click on the item in inventory) enter.
I also have some characters at level 4 and one at level 1, so I'll be happy to group with you and show you around if you want.