Lesbian Couples Trying To Conceive???

So I’m 17 years old and my dream has always been to have a child! The only downfall I’ve run into so far is that I’m a lesbian so obviously I can’t just have some alone time with my mans and then hello I’m pregnant and I also understand that some straight couple can’t do that either. Anyways, I was wondering if anyone who is using a sperm donor or something along the lines of that would like to educate me on how it works. I’d just like to get an idea of what to expect in the future when I’m TTC. Thanks so much!