Hi Frank, you have an exciting journey ahead!
There is a good bit of older stuff out there in one way or another. Most any old model rocket kit any can be copied, with information from a couple of websites.
My favorites, and if you haven't seen them, buckle up you're about to go down a couple of rabbit holes
http://www.ninfinger.org/rockets/rockets.html
http://spacemodeling.org/jimz/
There are some companies making clones or upscale versions,like Semroc, but availability is spotty.
Erockets is a good place to look for those:
www.erockets.biz
There are a lot of good companies producing good model and mid-power rocket kits. Do you have a preference, like scale or sci-fi/fantasy?
Oh, and Estes just released the Orbital Transport in an upscale size!