Pick up the Ladnlubbers Survival Guide written by Smaragdadler (can be found on
www.subguru.com). Thats a very good starting point, as it will give you a number of pointers for further reading and training. As for the platforms ... personally I'd say the Helo, but then thats individual preference. Oh, another good link is the Commanders Academy & Dive Center ...
www.commanders-academy.com ... lots of useful info there.
Cheers
OS