The scratches are probably nothing to worry about at all. It depends on the depth. Boards get scratched, it just comes with the territory. Check sites like Backcountry Outlet for good board deals. I can give you a 50% off discount code if you buy something by the end of July.
It might be a good idea to get something a bit newer, but it defintiely isn't necessary at all, if you just want to freeride on the weekends. Just use a bit of base cleaner, or a brass brush, and get the dirt out of the base. Clean it up, give it a fresh coat of wax, and you should be good to go.
I just came off a 7 year hiatus. I thought I was gonna fall getting off the chair, but I never did. I was worried about running a green on a pow day, but it went beautifully. A few runs in, I had more board control than I ever had before. It's always akward at first, getting your legs back, but once you do, watch out lol.Taking the break, really made me appreciate snowboarding a lot more, and it certainly reaffirmed my love for it. I pretty much live like a saint and work a job I hateso I can afford this. Pretty soon, I'm gonna buy some cheap wheels, and go as much as humanly possible. It's consuming lol.