Welcome!....
I use mostly sectional (atlas) track, but for long straights, some sidings etc I use flex track, mixing atlas code 80 sectional and flex track is no problem.. I build my own tables, I use peg-board as the base, with 2x4 wood frame and a layer of Styrofoam for the top. No drilling required to run wires (poke holes from underneath w/nail. I PIN my track to the foam and use a cork roadbed. I can change my track plans whenever I need or desire.
DC vs DCC. Today if I were just starting I would go DCC. I have an affordable Digitrax Zephyr Xtra based system (I converted from DC to DCC this summer) I may never use all the features of the Digitrax system, but its flexable and expandable galore. It can do things, some basic even, that other are not able to do. I have converted most (not all) of my locos to DCC. I can easily run BOTH DC & DCC locos on it, at the same time even. Many newer locos are DCC ready, some use a plug//drop in decoders.
Local Clubs are usually a great source of info and HELP when needed. My local club is not handicap accessible (an upstairs location) so its no longer practical for me.
I agree 100% that Bachman has improved but Kato in my book is the best affordable locos and worth the little extra over other rtr brands.
JD