i had bugs in a peat mix i bought once, they were like little white spiders, they lived in the soil and never did any harm to the plant, i did however.
germinate your seeds, put them in a decent medium then leave them under a decent light, job done. let them grow nice for a couple of weeks then transplant, leave them some more, bout week or 2. At that point you will probibly realise that all the crap you gave them first time round, sprays, mg soil etc did nothing but contribute to the death of your plants, you will then worry about giving them anything because you wont want to ruin them with nutes etc. least thats what i did.
Good luck, and if you dont get rid of the bugs, get some flea killer or a bug bomb before you start and blast the whole area and let it air off for a few days, it kills everyting. (sorry organic growers)