We will see how BIAB goes and maybe I will want to move to traditional AG brewing but this seems like the best fit for me now. I think I will start off with a 6 gallon preboil volume and top up with water by pouring through the grain into the fermenting bucket on the advice of RM-MN.
Thanks for all the help!
Not into the fermenting bucket, into the boil pot. Grains have all kinds of interesting bacteria on them that you need to boil to make sure they are dead. Putting it into the fermenter without boiling is like playing Russian Roulette with all cylinders full.