Scotty,
Welcome to our online FFing community.
As for changing your line, I'd bet you probably don't need to yet. If the rod was used and "re-gifted" it probably wasn't used a lot. Fly lines can last for years. I fish a lot and my fly lines last years. What I'd do, is pull the entire line off your reel in the backyard and verify that the connection between the fly line and the backing (a thin cord that is wrapped on to the spool before the fly line) is solid. Then rewind the fly line back on the reel leaving out the final 20 or so feet. This front end of the line sees the most abuse. Look at it carefully for cracks and frays. You can feel the damage with your fingertips. If this section of line has no cracks, or maybe just a few, it's fine for fishing. If after you fish it a few times, you decide it needs to be replaced you can always do that but fly lines are expensive($20-70) so I'd stick with the current one unless it is obviously really bad.