If I was starting over from zero I'd find a lever action 30/30, a pump 12 gauge, a single shot 22, and a police trade in Glock 9mm or 40s&w..... That would get me by for pretty much everything to start with and I'd be looking in pawn shops and gun shows mostly for those.
To add to your current collection I'd add a quality bolt action 308 with and excellent optic. Loaded with 125-130s a 308 will out 270 a 270 and loaded with 178s it kill lots of thing at a pretty good distance.