If you're new to boating and not sure what you want or need I suggest you look at joining a boating club. There are many on the bay that offer different size boats to rent/use. Figure out what type of boating you prefer (fishing, cruising, skiing, etc.) and then buy a boat that fills the need. Some clubs even offer classes on the skills you will need to be a competent boater. It takes a lot more knowledge than just being able to steer the boat.
If you were born after 1972 in MD you will need a boater education safety certification, if you do any boating in DC you will need a certification regardless of when you were born. Here is a link the MD online course: https://www.boat-ed.com/maryland/?g...jH3vuJXgGjSeWTh4ITtUUUTjE0WWFDy6PkaAvJD8P8HAQ
This sounds like good advice. I'd imagine that realizing you bought the wrong boat could get really expensive really quickly...or maybe ruin the hobby for you altogether.