Quilting is practice practice practice and more practice.
Just when you get a basic block down to an acceptable finish - you'll spy a block that's a little more difficult and it'll challenge you to practice some more till you get it right.
So start simple - get that 1/4" RIGHT on your machine (remembering that sometimes it's not a 1/4" measurement).
I've seen WONDERFUL ARTISTIC quilts that are made by MAGICAL quilters. I know I will NEVER be able to make what they make - but that's ok - I make what I can make ... to my satisfaction.