Good, honest question...Timekid.
Can you help us out a little by answering a few questions?
1. Do you have ANY experience putting together models or painting them?
2. What equipment do you have/are willing to invest in (or can afford)?
3. Do you know anything about the x-wing beyond it's name? (i.e have you seen Star Wars?).
4. What is the scale and manufacturer of the model.
Some general answers: Reference is critical. Get whatever you can. There are lots of excellent books that have pictures of the actual models used in the movies. Anyone here can probably give you a list of a dozen or more. The internet is a gold-mine. There are literally thousands of images available to help you get it right. You have lots of decisions to make, though. Do you want it to look new, or "used" as in the movies. Do you want it to appear to be flying, or sitting on a landing pad or in a display as if it was deep in a swamp. Get the drift?
Once we know more about what you know, we can direct you where to get more info, advice, add-on parts, etc. If you're a novice who's never used an airbrush there is very different advice than for a seasoned airbrush artists who just happens to never have put a model together...vice versa, maybe you've built some models, but don't know about lighting them up or adding special "add on" kits.
Best of luck to you. It's a great hobby and there are people here who will help you and give you support to keep at it.