Gus,
Welcome to a fascinating and amazing hobby!! And welcomw to the FSM Forum. It's a great thing to have this much knowledge and advice at your fingertips - all you need to do is ask...............................
James and Darren have some very sound advice. Get a book or two that specifically deals with the basic techniques of plastic modelling and explains the different tools what we use. Kalmbach publish some very good ones.
Finescale Modeler magazine has a series of articles on many different subjects entitled "Basic Techniques = Advanced Results"
These articles explain how very simple techniques can improve your modeling skills and create a better model - not by hundreds of hours of practice on hundreds of models, just a simple explanation of the basics needed and examples of practical application - things like simple airbrushing, placing decals, gap filling, etc .
Keep your first models!! Only throw out an old model when it is no longer useful to you (maybe give it away to a neighbor's kit and give him a thrill-he'll probably think it's the coolest thing he's ever seen) - I've not got any of mine - they're all gone because I don't need that type of "inspiration" to help me make better models, but I did use them for many, many years as a prod for improving my skills. It bloody well worked, too.
Definately finish the kit. You might not think it looks as good as you'd like it to, but to others, it may very well be fantastic and they'll be in awe of your skills. I'm not kidding - I build lots of models (mainly for other people) and sometimes I look at the model and think "oh crap" but the new owner is always simply thrilled with it.
Never sell yourself short, mate. I've seen quite a number of guys post pictures of their very first models on this forum, and I gotta say I wish my first models had looked that good. And one thing you won't get is a bagging (nasty criticism) - you'll only get encouragement here.
So have fun - and remember, I can guarantee your next model will be better than your last one.
Cheers, mate
LeeTree