You'll definitely need a helmet - so don't skimp on this - get a helmet that's well fitting and there are many cool colours to choose from.

Also, invest in some bike shorts or 'tights' (longer than shorts, down to ankles if cold) you'll soon find out what works for you.

Absolutely wear a high vis jacket!

Always wear cycle gloves even if it's warm - if you come off, you'll save your palms...

Yep, puncture repair kit - and DO learn how to mend a puncture before going out too, will help :-)

I wrote a recent article on 7 essential kit you need for every ride, in my Beginners section.

http://easycycling.com/?p=180

Have a great first ride...!!!!