Well, the first question is what goal do you want to accomplish with a different lens?
It's a fixed-lens camera so you'd have to use a 35mm lens adapter such as a Letus, plus the 35mm lenses of your choice. It'll give you narrower depth of field for a more "filmic" look, but it will also eat up light.
There's TONS of posts about this already here on the Cow, so search around and you'll learn a lot.
Well, as already mentioned, you'll need to choose from one of several 35mm DOF adapters depending on how much you want to spend (Letus, Brevis, Redrock are some names you should check out). Generally, you will get what you pay for.
In addition to the adapter, you need your actual lenses. If you're on a budget, Nikon or Canon 35mm SLR still camera lenses are very popular. You'll probably want a set of primes in different focal lengths, since zoom lenses are usually slower (use more light) and cause other problems with the DOF adapter.
There's an EXCELLENT article on this subject right here on the COW, that you can read at this link. Check that out to answer any other questions you may have.
You can't attach a 35mm camera lens directly to your camera. You'll need a addapter the most popular right now is made by Letus. http://www.letusdirect.com/ This fits onto a rod system and is mounted between your camera's fixed lens and the 35mm prime lens you want to attach. Make sense?