New here, TTC to expand our blended family ❤️

Casey
   DF has 17 DD, 14 DS and my DS is 7.. DF is obviously a bit older than myself. We spoke with the kids and all decided we would like to try for one. So this is where we are now! 
  We had my Mirena removed beginning of September, so my doctor was adamant on telling us to be careful sometimes you can conceive right away other takes a bit. 
   Hoping anyone has some good advice for this 28 yo Bonus Mum and her DF!