The main thing that made me want to do trials is when i watched a Hans Rey video (Big Five), then a few years later i saw a guy doing trials on a 2003 Onza T-Mag, so i decided to buy a Onza T-Pro and start doing trials.
What you need is a nice little area where no one will bother you. All i can think of to put in it is pallet boards and maybe a large log, ideally it would have a couple of park benches already there.