don't get them if you have thinnish hair, you'll have scalp locks
How long is your hair?
Don't go to a shop to get them done its a waste of time and money. Just find a good friend and post up with them in a comfortable place cause its gonna take awhile.
Never use wax or any shit like that, all it does it ruin your hair and it wont lock up properly, and be all sticky and gooey.
Try and get a good natural shampoo and throw your conditioner away. check out www.drbronner.com, they have some great soaps pretty cheap too. peppermint is my fav.
also, probs the most important: your arent going to get dreads overnight, its a long process and journey and the majority of your hair probs wont be fully locked for atleast a year or 2 depending on your hair type. don't let this discourge you, dreads are great if you have the patience to stay with them.
eh im just rambling now, if you have any questions or wanna know to to auctually start them feel free to pm me, siccors havent come close to my hair in like seven years.