hi hon, good decision I think. I usually find going thru the site map (at top under help) is the quickest way to find what i need on AW.
About your bookings. If they are nice guys who you've met before, and you want the security of knowing you have a bit coming in - I'd email them. Tell them you've changed but say on this occassion (make sure they know its a one off) you'll honour price for them. but as your prices were so low, prob better to just start again.
Good luck xx