Skinny jean leg length - help!

[SpicyPear]

About three years ago I ditched all my jeans for dresses due to being too fat. I'm now in the process of losing weight and am looking to buy my first ever pair of skinnies. I would mostly wear them with ankle boots, but for other times, how long should they be? I'm 5'8'' and the pair I tried and liked today touch the floor at the heel and crinkle up over the front of the foot. Is this okay? How are they supposed to hang? Is it acceptable to roll them?

Somehow I've never paid any attention to the ankles of ladies wearing them as I was too busy envying their slim thighs!

I like them long, sometimes I wear them all crinkly, sometimes I cuff them once in a big single turn up, so the cuff exactly touches the ankle, sometimes twice when it is warm with flip flops.

I'm only 5ft so they always tend to fit me as you describe. I do the same as GOBBLERS.
If I am wearing them with heels for a night out, I turn them twice so they sit just on my ankle bone.
If I am wearing them casually with Ash genial, I do one big turn. The same with flipflops.
If I am wearing with ballet flats or low wedge courts, I don't turn

Thanks ladies. I'm normally quite fashion conscious so not knowing how to wear a mainstream style had me all of a tizzy!