As one first timer to another I strongly advise you to invest as little as possible in time and money right now. Do just enough to get the boat out on the water safely and sail it as much as you can. My perspective on what my boat needed changed drastically as I discovered what I enjoyed most about sailing. The boat will sail just fine with dull paint and no varnish. Old sails will get you out there. Rebuilding an Atomic 4 is a great winter project but for now borrow an outboard or buy a used one that you can resell later. I've sold a lot of things used on E-Bay I never should have bought new at West Marine. Give it a real good scrub inside and out, get a PFD, flares, a sleeping bag, some throwable cushions, a chart book, a radio and GO SAILING!