C-band:
1) does the 12' dish have a working LNB on it?
2) does the 12' dish have a polar mount with a motor on it?
3) I think you might get the analog receiver to move the dish and tweak the LNB
4) I'd think with the 2700, you'd pretty much be in business for everything else
5) you just need the pieces to hook it all together.
Ku band:
6) the 2700 is fine for that
7) there are some threads about the effort of using the SuperDish
8) you can get that dish to work, but might want a different LNB on it (or not)
9) if you want to motorize, you'd need a motor and some information on mounting and alignment
The pieces to hook either setup together consist of cables, switches, connectors, and such.
Here is an
easy list for what's on Ku band.
Here're lists for
Ku, and C-band stations.
I'd start out on Ku, just 'cause the stuff is smaller.
No shame in starting with a fixed dish on one bird.
It'll help you get your footing.
Later, you can bring up more of your equipment.
I would do it in stages, progressively.