I personally think a pleco would outgrow the tank quite quickly. For a 10 gallon, I would heavily recommended doing a shrimp only tank. But that is a personal choice, I really enjoy shrimps and find them very intriguing. But if you really want to do fish, I would say a school of neon tetras. Guppies would be nice but they reproduce very often I heard.
Also in terms of moss, I would recommend christmas moss over java moss. I have both and I think Christmas looks a lot better.
"Life is not about how hard you can hit, but how hard you can get hit and keep going"