Looking for first Boat

After retiring from the Navy I think I'll try the smaller ones for awhile.
I'm a fisherman and we're looking at a 20' walk around that used. I'm omly
limited to $12,000 but what I've seen there's plenty to choose from on the
northeast coast. Around Atlantic City. Right now I'm looking at Sunbird
Neptune that's a 89. He's the second owner and has lots of records. I'll get
a surveyor to go with me because I believe the $500 is worth it. One big
worry I have is my pull vehicle. I have a 96 ford explorer with a V-8. The
book says I can tow up to 7000 pounds. We did have a double axle u-haul that
was real heavy and it pulled fine but what about when I launch the boat? Any
help will be appreciated.