I am also good with Lucas. Hell, name a character besides Link, Shiek, Pikachu, or ROB, and I am good with him/her.
Edit: See earlier post. I cannot fight online lol. I mean I CAN, but I have to go through a lot of effort and the other person would not be guaranteed a good connection, so I try to avoid it.
Lucas:
Nair is very good. Side B is overrated. Dair is excellent as a wall, retreating Fair is good when spaced well. Bair is weird, avoid using it that much aside from an occasional retreat.
On the ground, Jab, Dtilt, Fsmash, and occasionally grabbing are all you will usually need. Utilt after a low % Dthrow is nice though.
Master Zap Jumping and Magnet Pulling for recovering. Everything else is common sense, good spacing, not trying too hard to land kills, and playing safe.