TTC Please help

Me and my boyfriend of 2 years are TTC can anyone give me some sex tips or advice please?I'm 35 years old and have always wanted children.I was formerly married for 16yrs and of course TTC with my husband but that NEVER happened but ha sure nuff had 3 kids outside of us,so i made up in my mind that obviously its not meant for us ro have kids....WELL....now that my ex husband is now out of the picture i am now back with a guy that i used to date 12 years ago,he's The Best Thing that has ever happened to me.We reconciled back in 2016 and now we would like to start our own family.So any advice would be Great