mate as the other guy said you're getting way ahead of yourself, you have just bought seeds worry about the nutes when you are well into veg and flowering.

I use Ionic soil grow and Ionic soil bloom for growing.

Miracle grow soil probably isn't the best thing to use, especially not on it's own you want to make a soil mix, you could use miracle grow and it will work fine but it's very chemmy.

Try a mix at least of about 1/3 perlite 2/3 good quality potting compost, you should always use soil lightners like perlite, vermiculite or horticultural silver sand.

I use `1/4 perlite (maybe a little more) 1/4 silver sand 1/4 manure and 1/4 top soil.

Hope this helped