Yeah, you really need to get a vid up for specific help. Good, fundamental things you need to have down are:
1. Short hopped double/single lasers. Practice this, you should be able to hit any character, even the short ones such as Pikachu or Meta-Knight. Also, learn to use the lasers to open up combos. Getting hit with a Falco laser causes slight hitstun, and you can get in moves during this stun if you're close enough. This is a great way to land your kill moves.
2. The Chaingrab. Be able to do it, know what percentage you can get people to, know how to do different things out of it, (Dair, Nair, Gatling Combo, lasers, etc). Learn how to chaingrab to the edge, then spike them off.
3. Gatling combo. Details are in the stickies, basically it's canceling a dash attack immediately into an upsmash.
4. SH lots of aerials. Nair, Bair and Dair are amazing moves, and you should be able to space them against a grounded or aerial opponent.
5. Spacing on the ground with Ftilt, jab combo, and dash attack. Know their hitboxes and ranges so you can keep opponents at arm's length. You never want to be right on top of your opponent with Falco, so learn to keep yourself spaced.