AG, not BIAB, batch sparge, guy here. Started with extract but loved the mystique of AG. I hated bottling but looked at the process and streamlined it as best I could. Finally got tired of it and started kegging. It has a few problems like leaks and spilled beer and lost gas and cleaning stuff. Still prefer it to bottling. You'll find you need more kegs than you thought. You'll need a keezer or kegerator. Then you'll need a bigger one. I do bottle some from the keg to take on the road but use a piece of tubing on the tap to do it. I'm cheap.
Three upgrades for 5 gallon batches that were game changers for me: 15 gallon kettle, great burner, great chilling method. Really, the whole idea is to get cold things hot and hot things cold. Once you do that you toss 'em in a jar with some prehistoric critters and wait. Echoing others as usual, do your research. Talk to experienced guys. (lots of them here) Have an open mind. Have a budget. If your one of those crafty types, you can make a lot of gear way more cheap than you can buy it.