2nd time around

Hi everyone !! I have a 13 year old daughter and we just recently started trying for number 2. We would love a boy this time as my fiancée is an only child and this will probably be our last child. Any tips on how to better the odds of conceiving a boy ??? Also when's the best time to conceive ? After your period ? With my daughter I wasn't trying so this time is new  to me !!!