Haha this was what I had trouble with too in the beginning
![Tongue :P](//www.gtastunting.net/Smileys/gtas/tongue.gif)
Tbh it's hard to give better tips than the ones already given. Always lean into the wall and only tap lean forward when wallriding. To get into a wallride you sometimes need to lean back into it unless you come up from a ramp.
btw wallrides are easier with FL-on I think, not sure though
![hmm :hmm:](//www.gtastunting.net/Smileys/gtas/hmm.gif)