Engagement pictures

So I’ve been taking pictures for years and have been taking so many of my baby and I’ve actually gotten really good that people tell me I need to start a business. A lot of people have been asking if I can do pictures for them. I’ve only done it for some friends and neighbors and haven’t charged people even though I know I could get a good amount of money since I’ve gotten so good. Anyway my friend asked me if she could pay me to take engagement photos for her and I’m so excited! I could definitely use the money so I won’t be doing them for free since I have to take time away from my baby to take them and spend a few hours editing. I just don’t know how much to charge. I feel bad charging in the first place but she did ask if she could pay me to take them. Has anyone gotten engagement photos? How much did it cost you? I was thinking of charging her 100-150 but not sure if that’s too much or not? What are everyone’s opinions?