Just like Natmoon said, its better to do your resurch first, this allows you to know what you want and helps you save $$ because you have asked questions on this type of form and recieved the info and types of products that you need and not the most coslty stuf. plus if you go in and say I want to grow tom. how do you want to grow your tom. soil, hydro, aero. ect.
I went in a shop when I first started and the guy tried to sell me the most costly products. He was cool but after figuring that I might need all that stuf I went back to the drawing board, and found out for what I want to do I didn't need half the stuf he was tring to sell me.
GLG