What parts should I buy?

I have been doing a lot of reading and am confused. I have the cx capture card but what else do I need besides the vcr. I have been trying to buy some things on ko-fi.com and just don't know what i should buy. I want to do this one time and do it right.
ADA4857 amplifier? And there are 2 diffrent clockgen mod parts.

What should I buy?

Thanks for the help!

Andy