In order to do a wallride, you want to make sure you have a decent height ollie so that way when you do roll up to a wall, you could actually get your wheels locked on. Now, it's very difficult to sometimes turn off the wall once you're already on it so, sometimes you end up just sliding down the wall and jumping off your board. It's much easier if you put your hand against the wall and push off.
That's going to make this trick easier and a lot more accessible for most of you. Now, some people like to skate directly head on into the wall and some people like to skate parallel to the wall and then, ollie from there. Now, it's up to you if you want to skate parallel to the wall from your right side facing it or you want to skate to the wall with your left side facing it.
Some people have difficulty ollieing using their left side versus their right side or vice versa, so it's really something you should know how to do before you even start to do a wallride. If you have problems getting height, you want to maybe pop your knees up a little bit more and that's going to allow you to get the height that you want. Don't be afraid of hitting the wall.
It's just a wall so you don't want to go too fast, but you're not going to get too hurt trying to do this trick. Some people also have problems letting their back wheels slide on the wall instead of the whole four wheels so it's really up to you if you want to a little wallslide or wall check or a wall pin. It's all up to you. It's all about preference and it's all depends about what you want to do with skateboarding because that's just the ultimate expression of what you are. That's how you do a wallride.