Looking for advise about IUI??

So I am a single woman who for one reason or another want to start this journey to baby without a partner, I have a very close friend and my mother is very supportive so no worries there.
I know I want to go down the route of sprrm donor. How long will it take for me to get approved for it? Years? I'm saving at the moment as I plan to go privately.
Anyone in a similar situation?
Thanks lovelys.