Previously had an underwater case for a point and shoot Canon. Worked great for years but loaned out the camera and the borrower broke it. Canon no longer makes that model so the underwater case is now useless. Was debating a Go-Pro but then saw this full kit for much cheaper and great reviews from actual divers. (Go Pro reviews seem to come more from extreme sports than diving.)
Can you use a extension pole and light at the same time not sure where the light would mount ?
No, you can not. For the light, you need to have an arm. With the extension pole, there is no way to use a camera mounted on a base with an arm.