Look around for threads on GUE primer. For the vast majority of folks, all the equipment you need to change to try it out is:
-7 foot hose ($20 right now at DiveSeekers I believe)
-BP/W (can borrow or most instructors have a spare to rent you
-Non-split fins ($30-50 on eBay for JetFins in really good shape)
Don't worry about some of the finer points on required equipment yet...low volume masks are nice but not a deal breaker to not have one, no need for backup lights (although a used Scout or similar is nice to hold your d-ring down), etc.
-7 foot hose ($20 right now at DiveSeekers I believe)
-BP/W (can borrow or most instructors have a spare to rent you
-Non-split fins ($30-50 on eBay for JetFins in really good shape)
Don't worry about some of the finer points on required equipment yet...low volume masks are nice but not a deal breaker to not have one, no need for backup lights (although a used Scout or similar is nice to hold your d-ring down), etc.