Not much in terms of manuals from Silverline. You can read about the company and the boats
HERE,
HERE and
HERE - that last one isn't maintained any longer, but there's some good information there. I had an early 70s Comoro, and really liked the boat. Good cruising boat.
Regarding help on it, just start asking questions. People can point you in the right direction. Might want to ask out in the main forums, not just Silverline specific. That will get you more views and responses.
Welcome aboard.