As far as the kid introduction thing goes, since they are younger, you may want to read back on Ginger1's thread about how it went there. It was pretty much a non-event but that was because they both put some thought in to making it a non-event. For B and I we just treated it as "normal" - having dinner with her daughter and her family, S24 waving as he wandered through the house engaged in his own life .... And yes - I was pretty nervous too.
Once that hurdle is past you'll find opportunities to get together to expand.
And for heaven's sake, stop being so analytical and just relax - people have been dating and getting together for a very long time
On BD H52, W50 T27, M26 S21, D23 BD-9-Mar-16 D-15-Jan-18 Final-19-Apr-18 I am a storyteller. The story may do you no good. But a story is never for the listener. It is always for the one who tells