A few of my friends BMX and I thought I would get into it as well but I have no idea where to start, I'm looking for a bike to use in skateparks and stuff. Looking for quite a light bike, one which would be simple to do tricks on. I would be happy to buy a bike and buy new parts and stuff. If you did recommend a bike to buy new parts for I'd need the tools and parts which would be suitable to do it (I'm a complete beginner to this). Any help?

btw i was looking at these bikes: - http://www.danscomp.com/101678.php?cat=BIKES#
- http://www.danscomp.com/101568.php?cat=BIKES#