Hello

Hi FionaO, and welcome!  Wow, you have an impressive running portfolio!

Planning on some private swimming lessons sounds like a very smart plan - one on one help from a knowledgeable teacher will surely get you in the direction you need to be swim-wise.  Goggles tend to be an individual preference - some brands/styles are made for smaller faces while others fit most, plus some offer more or less peripheral visibility.  It would be advisable to go to a store that allows you to try them on, that way you'll know they fit before you buy them. A general rule is put the goggles to your face without the strap around your head to test the seal.  Facial features may cause one brand to fit better than another (think deep eye sockets or a wide nose).

Bike - sounds like you have a good plan there, too.  Clipless pedals aren't as scary as many folks make them out to be, just be sure to practice getting in and out of them in a safe area before heading out to the road. 

Typically during a race people wear one outfit, a tri suit.  This can be one piece or two piece depending on your preference.  They are made to swim, bike, and run in without changing clothes.  

There are many helpful people and threads around here to help you answer your questions and provide support.  Good luck, and above all, have fun!