I started out in June with an Omega SS 175g, Buzzz in elite Z 178g, and a Max weight Champ Boss. I've progressed pretty quickly (I'm now hitting 375-400' drives and throw my Drone/Obex when I used to throw my fairway drivers) as I've had some Ultimate playing in my background. I'd say, start of with light weight and base plastic. Don't think that you can throw those max weight, champ/opto/Elite-Z plastic warp speed drivers straight...you'll be disappointed. I know I was.
I'd suggest finding some putters that you like and learn to throw with those and a few midranges. I was using the Omega and Aviar P/a in R-pro for my first couple months and the Buzzz and Cobra as my mids. I remember when I didn't like the feel of a 13 speed driver in my hand. Now, I feel like I have to fan grip anything under a speed 9 or I'll grip lock it.
I'd stick with fairway drivers like a Teebird, Eagle, River, or Trak if you want to throw something faster. Once you can get these guys out past 300 with accuracy, you'll love what you can do with those high speed drivers (which I'd recommend in base plastic).
I got into a premium plastic kick early on, but it is really enjoyable to learn to throw base plastic and see it break in to how you like. I've got a three DX discs each of Wraiths, Destroyers, and Bosses in different weights and stages of wear. I never thought I'd have discs that would break into anny/turn discs back when I was buying premium, but with my DX discs, I get some turn/flip when I power up and get some glide as well. I'm slowly filling up my bag with Pro plastic nowadays.
It's fun to mess with different plastics and see how they affect flights, and you can do this with a mold that is offered in a companies equivalents of Star, champ, Pro, DX.
What may take a while is figuring what weight disc you are most consistent and with what kind of plastic. It wasn't until I wanted to build up a 150 class bag that I experimented with 150-170g discs. A 161g DX boss will fly very differently than a 175 champ Boss, and you may want both in your bag for the shots they provide, I know I do. If you find a mold that feels good in your hand, and that you can throw consistently, start seeing what it does in other weights and other plastics, you may not need to go crazy on the molds that you need in your bag. Some people can get away with 4 molds in their bag, but have multiples in different weights and plastics.
of course, there are those like me, who just have to buy everything new...
Have fun!