Welcome to sailnet (aka, SN, SiNcity etc). Yes, there is a lot of activity on this site compared to some others and most of the folks here know a lot about boats.
Your boat looks like a nice starter
boat for the following reasons:
- it has a trailer (much cheaper then a slip or mooring - storage in your own back yard is way cheaper then a boat yard too)
- 21' is a good size, not too big, yet not really small (everything costs by the foot)
- 1980 makes it an older boat but not as old as some of them (like mine)
I assume you have the mast and boom and maybe even some sails for her? Did she come with an outboard engine?
Is the trailer in good shape? Do you have an adequate tow vehicle for it (you need to know the weight of the boat and the rated towing capacity of your vehicle)?
Congrats and good luck.