Hey Saoirse, how's it going?
My wife has a fabulously easy recipe, just put a splash of marinade (tamari / soy / worcester sauce etc etc) over the meat in the crockpot, and leave it on low for 8 hours. I add a bottom layer of onions and carrots strictly for taste. Then the meat can be shredded before serving (what I *believe* is called barbequeue in godless america, but what I will always call shredded meat).
In terms of reheating, it's pretty easy to add the cold meat into potato topped pies or other pseudo-casserole meals, although because the meat is pre-cooked, you only have to cook the veges in it. Anyhoo, I'm sure you know all the cooking basics, being a mum and all. Are you wanting to know individual recipes to branch out into?
And yeah, the meat stock makes a pretty good bouillon for breakfasts too.
This is a good way to do corned beef as well, which I wholeheartedly recommend with onions (slow cooked) and tomatoes (served raw).