I personally don't like RIT dye for clothes but that's because i wear them hard and wash them often. But RIT is good for curtains and linens and things that won't be washed every other day. If you want to experiment with the RIT there's no reason why you can't. It's less expensive and easy to find in grocery stores and local shops so it will be available while you "play" to find out what you like.
Then when you are sure what you want to do, find a store or internet shop that has Procion dye. I've always loved Dharma Trading Company online because you can buy kits that have some of everything you need or you can buy all of the kit items individually as needed. The last i did some comparing, their prices and selections were the best for what i wanted. You might be able to find the supplies at a shop near you, unfortunately for me this isn't an option.
Even if you don't want to buy from Dharma Trading, check out this page
http://www.dharmatrading.com/dyes/dh...cion-dyes.html
That's the dye that i fell in love with and swear by. On that page, there is a lot of info about the dyes, links to other pages and reviews at the bottom so you can see what others have to say.
Now i want to go dye something lol