I am switching boats currently, the one I am switching to has Bravo 1's. Need to know how to conect the engines to the bravos since its a totally diferent system (no trans). do i have to change the bellhousing? how about the starter engine? any advice would help.

Do a search on this there are a bunch of good threads already describing it

If you are going from a TRS to a B1, You will also need to glass your transom closed & re-cut for starters... & yes there have been discussions here before that you may want to also try searching for.. Jamie / Lakeside

im switching boats that have the bravos installed, im refering more to the engine than the transom. I know i have to ditch the tranny. How about switching bellhousing and such?
No transom work needs to be done, drives are installed, the engines are the ones being switched from one boat to another,

Oh...

Yes you will need to ditch the tranny & use all Bravo stuff. Like flywheel, bell housing, coupler & Shift bracket.. Your seawater pump should be able to be reused & exhaust as long as it was thru hull.. J