An intro and a question

[nimiiwin.livejournal.com]

Hi, everyone. I just joined and I'm not particularly "crafty" but I wanna be! :) So I'm trying new things, some with spectacularly bad results! :) That's okay, though, it's all still fun. One thing I want to do is make some postcards with collages on the front. What do you think would be a good thing to "seal" the collage? I don't know if I can use decoupage stuff or what would be the best thing?