Alimony amount

I’m currently separated and in the process of divorce. The goal is to do a no fault divorce with a mediator instead of lawyers. How do I go about deciding on an alimony amount? What do you get in alimony if you don’t mind sharing? He sends about 600 a month currently and he makes really good money so I’m sure he could send more. We also have a child who I have majority of the time but he sees often…I don’t want to put him on child support as he does take care of his responsibilities as a father but I also don’t want to make things too easy for him (if that makes sense). I wasn’t working for a while after our kid was born (something we agreed on) then I found out about him cheating which started a chain of events which lead us to separating, him finding a new place to stay, me trying to rush and find a job (which took months and months of searching), me and our child temporarily moving back home so that I could work and save up for a new place. That sounds like a lot when I type it all out and that’s not even the half of it. Anyway I have no clue what I’m doing here and this is all a lot to take in so I really need some help or guidance.