Welcome to cat sailing Jon.

First I'd check that the hulls are sound. If you're not confident get someone you can trust to have a look and see if there are any soft spots or signs of delaminating. No point in spending money if the basic thing is bad.

Get the boat rigged and sailing. You can better see more objectively at just what is needed and what you'd like to do with it that way.
If there's a sailing club within reasonable distance I'd recommend you go and talk to the people there about the boat. I'm sure they'd be very happy to do whatever they can to put you on the right parth.

Good luck,
Bern.