Hi Laura
First and foremost, welcome to the world of sailing, pleased that youve seen the light, Lol.
The forums have plenty of very good advice and this one is brilliant, secondly, take the time to walk around marinas and talk to like minded (cat owners). you need to consider where you will park your purchase, on a mooring or marina, the later will not be cheap as you will most probably take up to berths.
Contact you closest Royal Yachting Association and start your "Day Skipper" course then venture on from that, there is so much to be learnt should you wish to bring a vessel back from overseas, being in a fleet does not make it any easier if the weather turns bad...?
All the very best and do not be afraid to ask this forum plenty of questions, where here to help.
Stephen