You can buy tracks directly from LEGO. You go to LEGO service web page and follow steps below:
Click on BRICKS & PIECES just below the banner
Then BUY BRICKS
Provide your age and location (please be aware the list of countries where LEGO is shipping to is limited)
On the left side you have an option to chose parts from particular set. In this case use "...
Warning: LEGO pieces were harmed for this answer
How the switch works
So, how does it work then? Well, let's open it up!
The back plate is held into place by 14 pins. We'll carefully pry it open with a knife. Alternatively, we could use a drill bit to slowly scrape off the pinheads.
Both methods are destructive. The back plate needs to be glued back on ...
There's already a good answer for where to get the track pieces, so I'll tackle the reset.
Also, since I don't have any brick, what set of random blocks, for the support structure, is better?
If you are relatively new to building with LEGO, building a custom roller coaster design may be a really difficult first challenge.
There aren't any official LEGO ...