whats the gb bridge for i dont know if i should get it with my 256 linker set help asap!

It's a device that allows you to play / backup your gameboy and gameboy colour games on the gameboy advance via the flash linker. Basically a physical "bridge" to enable the different size carts to fit in the GBA.

http://www.jandaman.com/gameboybridge.shtml

should i ge tthis do i need this?

Well if you want to backup gameboy and / or gameboy colour games, then yes.

is there any gb color games good?

Not sure, never owned one. There are some Zelda games and mario games, so i imagine there would be some quality titles.
Try doing a search for some game information.

thanks a lot for all the information