o god there's going to be lots of frustration, tempertantrums, and several questionings if your good enough. the main key is to never say "i suck" make sure it is insted "i have a lot to improve on"
as far as sugestions for your drawings there's only general stuff that i can say, as you have nothing posted.
1. to loosen up your drawings do what are called quick studies (drawings lasting a max of 5min) and do them with something you can't erase or be timid with like a black marker. do quick studies live not from pics, get family and friends to pose for gesture drawings (drawings that capture the basic gesture of a person with very few lines)
2. copy (not trace) pictures that you like, or styles that you want to imitate
3. play around with differnt mediums, you'd be surprized how well your brian seems to work sometimes when it has something new to play with
4. carry a sketchbook with you everywhere, you never know where insparation's going to hit you. i bought a purse just to fit mine
5. post. enter contest, and always ask for critical critiques, and critique on other's work (even better if it's in a social setting so you can discuss with other what worked and what didn't)

if you have any other questions on this or anything else i would be more that happy to talk more. though you might want to note me cause this is all getting written on your wall and it's going to extend forever.
all luck to you in everything you try.
RedD

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watch the movie The Fall- it'll change your life