Depends on how fun you think riding will be, and how fun you think your friends are.
Riding more will mean you won't see as much of your friends, unless they start riding too.
But if there are other riders around, getting a bike and starting to ride is a great way to make some friends in that crowd instead.
Tricks done on a bmx bicycle .
a bmx class
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freestyle means tricks on a BMX
it matters what you are going to use it for
You can either check youtube or most bmx bike websites have videos of tricks, check eastern.com
loads of people have them you should get one there fun to use and learn tricks
a bmx rider
Is the Scan R10 a good bmx bike for doing tricks on
You should be able to 180 and fake out. Also you should be able to bunny hop at least 18'' in the air.
If you actually want to go somewhere besides the skate park or your neighborhood, go with a BMX-style bike. You can go farther while doing some tricks here and there, not to mention they're probably faster. If you want to do some major tricks, though, go with a skateboard. You can do much more complicated tricks on a skateboard and they are actually meant for doing stunts, where as BMX bikes are just modified.
20 kg would be very heavy for a BMX, and the extra weight would make several tricks harder. But if you can do them that bike should be close to indestructible.