Becoming self employed

Hello everyone, I'm new to this and after a few tips.
I am just about to finish my maternity leave, I would like to go self employed and only do a couple days a week nursing.
How do I go about it and what is the going rate these days?
I am obviously qualified reg GDC, I have been nursing for almost 9 years with tonnes of experience. I am also implant trained.

Will be grateful for any info

Thanks in advance =)