i dont want my dwarves crafting stuff with it untill they are legendary +5 so im wondering whats the fastest way to train up weaponsmiths and armorsmiths.
Apart from the advice already given, don't spread out the skill gain among
too many smiths. If you're going to have multiple smiths, do it right: Plan out what weapons & items of armor you're going to be making, and check your dwarves' preferences: A dwarf who likes shields has a higher chance of producing a masterwork shield than one who likes, say, low boots. So, ideally, you should have one smith making helmets, another making axes, etc. Assign a separate forge only usable by each smith, so you can control who makes what.
Also id like to know which is the easiest way and less micromanagement instensive way to process goblinite ( as my embark is completly ironless ) using auto melt stockpiles
d-b-M is the Mass Melt selection (works just like Mass Fobid and Mass Dump).
Also ive seen as there is rotten clothes everywhere and i believe they are impacting my fps, is there any way to automatically get rid of them? or to place in auto trade stockpiles (or stockpiles under a dwarven atom smashed)?
As an alternative to DFHack, you can put a 1-tile Refuse stockpile under each garment, which will (slowly) cause the clothes to deteriorate and disappear.
As for your crippled militia commander, just move him to his own squad, and assign him a bedroom and workshop (whatever kind you want) just inside the entrance to your fort, with his own little food & booze stockpile right there. Maybe a meeting area, too, so he never has any reason to wander off. That way, if anybody gets past your regular militia, they've got to deal with him. The best watchdog is a weaponmaster watchdog.