I'm looking to get a wireless router.

My understanding is that I can simply, after configuring the new box, move my wires over and they will continue to work as now.

BUT I have concern with regards to "security" on the wireless part of things. Specifically, I'm not interested in becoming an access route to the internet for anyone nearby who has a wireless setup. Can this be prevented and, if so, is it a relatively easy thing to do?

I'm also not at all interested in using others' setups as access by myself. Is there some way for me to know that it is **my** stuff that is being used by me.

Any advice appreciated.
Jim