for dry fertilizers you would need for macro nutrients:
KNO3, K2SO4, K2PO4, Mg (this is just epson salts that you can get at your local drug store)
for your micro nutrients, or trace elements:
CSM+B and possibly additional chelated iron (i personally use seachem flourish and seachem iron, but that's just me)
you can purchase these items from the forum sponsors here, or check out your local hydroponics shop in your area. this is where i get mine from.
these are the two more popular fertilizing regiments that most members here follow:
EI Method
PPS Method
give those a read and see which suits you most. if you feel that you do want to go the liquid fertilizer route, i would suggest the seachem line. here is a dosing chart:
Seachem Dosing Calculator