need help with getting good on riven

Hey guys, I've been playing riven for a couple months now because shes really fun. I like her playstyle and kit, but i suck with her. like I'm complete trash. I never tried to get good with her till just recently, because I always played her with friends who didn't care how i did.Now that I'm trying to be good with her I just don't know what to do. Any help is appreciated, thanks. :) sorry if this is in the wrong board area