The last grow for nutes I went with the local hydro shops home made variety. It is geared for hydroponics, but it seemed to work well. It's just a basic 3-part base nutes (3 containers; one for veg, one for bloom and the 3rd is a mix you use for both stages).
I didn't feed any nutes until just after week 4, and that's about when I went from veg to flower.
I'm eyeing going 100% organic here, so I won't be using the same but it seemed to work well. Also pick up a bottle of CalMag, and give about a 1/4 dose of that when you start to see calcium/magnesium deficiencies. (Trust me, once it pops up, quick research will have you spot it quickly).
...and as bio stated, I was using the MG potting soil mix. Since then, I've used pure hydroton, pure perlite, 100% organic compost (only compost), other variants of soil etc. The MG fits about in the middle of my other tests as far as growth quality.
Look at it this way; this is your first grow. You need to learn for yourself. It worked very well for me (I had three plants that size in that grow all in MG) and apparently it didn't work well for others (or they're just fabricating stories after hearing others who haven't used it bitch, and just repeating information that they haven't even personally backed up).
I'd say if its what you have, test it out. What's the worst that can happen? You lose some of your first grow. Whoopty shit... how else does one learn?
Besides, if you can learn to grow in a hot, non-preferred soil, imagine how well you'll be able to control future grows that are nute-neutral at the start.
You'll also become another member who can and will actually help fellow MG growers with their issues, as opposed to just bashing them and the soil they choose to grow in.
-spek