First things you should learn should be how to use his moves effectively, how the matchups works and knowing when and where to use ATs or just basic moves(my opinion, some others may be different). Lucas's worst matchups are the Deadly 4 - MK, DK, Marth, and GnW, worst one is probably GnW. After a while though, some, like DK and MK, aren't that hard if you get a lot of practice in. His best matchups are CF(lol), Ganon, Jiggz, DDD, Ike, Bowser, Fox, and maybe Samus. For a secondary, someone like MK or Marth would be the best choices. Approaching moves should mainly be Nair and Dair, Nair works very well on shields and Dair can set up kill moves and Dtilt locks. Spacing should, of course, be PK Fire. Camping is PK Fire too, gotta <3 that move. Recovery, you really shouldn't use PKT2 unless you need it, but Magnet Pulling and Zap Jump and Wave Zap can help recover, along with Rope Snake. PKT2 works also, but can be gimped by most characters. Reliable kill moves are, of course, Fsmash. Some moves, like Dtilt, Dair, and Nair, can set up kill moves, like Dsmash or Fsmash. Usmash is risky, and should be used to punish bad airdodging and spotdodging, and even staying on the ledge, gotta <3 that hitbox. For racking up damage, Nair, Dair, maybe Uair, if used effectively, and rack up damage fast, along with PK Fire of course. A bunch of information is in my AT Guide, and some other Lucases made Combo Vids and vids showing how to do some other moves with Lucas. Try to watch some vids on well known Lucases, like Galeon or APC. Hope all of this helps you!
TOO LATE! Owned.