if you have the funds heres my soil ingredients, i dont really know the amounts cause i just mix it till if feels and smells right. or if you have a local grow shop you can get some premix soils.
spagnum peat moss
organic compost
organic topsoil
sand
perlite
vermiculite
red lavarock
worm castings
supertea mixed in to soil when added to the planters or as a top dressing
as a rule of thumb...dont use anything that has the miracle grow name on it, the prefertilized soils will be too rich for seedlings, and the time release ferts will mess with your feeding schedule. if nothing else find someone who has an established vegetable garden and dig up some of their soil.
there are lots of companies that make digital humidity and temp gages and thats what i use but i have never tried to use one of those analogue ones. good luck and happy growing...i wish i lived somewhere where it was easy to obtain good genetics...