Welcome to the forum
As Christmas is months away you still have loads of time to do all the research. Everybody on here will tell you to get some without a doubt! They are lots of fun and pretty easy to master.
Your biggest worry will be regarding the safety aspect. These "toys" are as dangerous as the person using them. With anything it's how responsible you are with them that will make them safe. Wearing the right protective gear and practising indoors first and with a friend or mum
for support will always be the best way to avoid injury. Usually within a day or two most people are walking confidently on them! Unless your names Jason you shouldn’t have any major accidents on them (Jason is our most accident prone member
)
If you are near London there's a big meet on the 19th of August see the following thread for more details -
http://www.projumpforum.co.uk/index.php?topic=724.0 there will be lots of people on bocks on the day and I'm sure the people present will be able to answer any questions you have.
Have a browse on the forum and most of the worries / questions you may have will already have been touched on, and if you have any other questions just ask away