You need to know her molting cycle. All females are different because of their age. Young females may molt once a year and older females may be 2-3 years. The optimum time for breeding is 6 months after molting, any time after that she may be starting to grow her new exoskeleton. Then you also have to cool her down in that same period after she molts. To make it even more difficult the male has to be freshly mature within 4-5 months that she hits all those periods. You can't just put a male in with her for a long period of time and hope the best. She will kill him. Egg sacks very from species to species. Some sacks may produce as little as 40 to as high as 1600. Tarantula females have to have a dark spermatheca to be old enough to breed. Males have to have had their ultimate molt.
It's not for newbies for sure. I waited over 30 years before jumping into Breeding. I learned the basics over the years. I just needed minimal help when the time came. Mostly reassuring myself asking questions I already knew. I aquired a few sacks from hobbiests over the years so I had experience tending to slings. Breeding is the easy part. Caring for 1000s of slings is where it gets rough. Sounds like alot of fun but trust me it's alot of work. Easiest species to breed is Avicularia avicularia. Start with that is my advice.
