First time trying

My husband and I are just now starting to try to have a baby. I've lost over 55 pounds to try and prep my body for this big event ;) I do have newbie questions. It's so hard with all the different websites so I'm looking for help. How often are you supposed to have sex? Is it true that having sex too often can lessen the sperm strength is that really a thing? My period has always been wonky so it's hard to tell my fertile days. This is all kind of blurted out but what do you all have to say ? What's are some must know go tos? Thanks in advance!