Might help if you indicated what movies/TV shows interest you. Star Wars, Trek, Battlestar, etc.
Anything Marvel or DC, I love comics.
Also Anything with Stan Lee
^^This is a great idea. Lightsabers from the Big Yellow Box <-- this is an old site that still works and you can pick a style of lighsaber to build and use his parts list to hit up the plumbing section at Lowe's or Home Depot . Something like this is a great starting point if you like Star Wars stuff.
This was my first prop endeavor, several years ago.
I didn't follow their directions exactly. Mostly that site got me thinking and looking around at stuff and seeing the parts I could use. I ended up with a saber handle that looks more Kenobi-ish then the LSFTBYB ones - but still pretty far from screen accurate. Very fun nonetheless.
try a simple foam helmet!
i did the iron helmet from skyrim for my first ever foam helmet project and it turned out really well!
if you want a bit of a tutorial i put this video up on youtube
pepakura file with templates are in the description!
FUS RO DAH! foam building tutorial for skyrim iron helmet - YouTube