Nice of you to drop in HistoryinScale. I'd say that 1/35 scale is the most dominantly built. It's any easy scale to work with and better detail and aftermarket parts available.
Tamiya is regarded by many as easy builds, because they tend to fit better and are pretty accurate. Italeri are good models and tend to be cheaper than most of the other companies. Dragon makes some fun kits, but builders seem to love or hate the fit. Academy, AFV Club, etc. Just stay away from some of the kits from the old Eastern bloc, they tend to need alot of TLC.
As far as fun builds, this gets harder. You may want something easy to start off with. I reccomend some of Tamiya's older kits such as the T-34 or Bren gun Carrier is a nice little build. There are so many and I don't know your tastes, sorry. Italeri makes a neat Chaffee or Sherman which were fun and easy. Good luck, you'll get plenty more help. Welcome to the dark side.
"It is well that war is so terrible, lest we grow too fond of it."-R.E.Lee