Hey,
good news that you're switching to Fox :D
Why did you make the choice, and who did you come from?
IMO Fox has advantages, and disadvantages.
Advantages:
- Great movement speed, both walking and running
- Good approach options like SH nair, RAR bair which are both fairly safe on shield
- Really fluid moveset, he doesn't have many "true" combos, however based on opponents DI, and ability to tech; you can really string together moves to build up damage
- AMAZING U tilt
- AMAZING U air
- Fastfaller
- Good reflector, can also be used for stalling in the air
Disadvantages:
- Fox is LIGHT AS F
- Grab range is very short, and doesn't have true follow ups from any grab
- Recovery is linear, and can be easily read by opponents
- Fastfaller
- Can be tough to finish stocks after a certain % point
All in all Fox is an amazing character, and there are plenty of resources out there.
First tips that I'd give, is get used to his movement (mentioned in another very recent thread), and his bait and punish play style.
If you have any more specific questions, then please feel free to ask (though I'm not amazing by any stretch) and I'm sure you'll get answers from someone.
Also, YouTube is definitely a great resource; search for Larry Lurr, Ksev, Void (used to play Fox, and there are videos out there).