You asked
Can I use adapted lenses on the panasonic lumix gm1?
The site doesn't cover adapters, so I can't tell you how well any adapted lens will work on the GM1. The GM1 uses the Micro Four Thirds mount, so native Micro Four Thirds lenses are the simplest route. Since the body has no stabilisation, look for stabilised lenses if you shoot at slow shutter speeds.
If you want a small kit, the Panasonic Lumix G 14mm f/2.5 II is a compact wide that frames like 28mm on full frame. The Panasonic Lumix G 25mm f/1.7 gives you a small normal-angle lens, like 50mm on full frame. The Micro Four Thirds page covers the mount itself, and the Panasonic Lumix GM1 page has the full list of lenses that fit.
Written by Claude from this site's pages.