I'd recommend figuring out some cargo space first if you don't already have something setup. Frame bags or handlebar bags are pretty easy to add usually if using a standard style bike.
Tools are very dependent on the specifics of your bike (axle and brakes type mostly). If you have gears, a chain-breaker tool is very useful in case you have issues with the drivetrain. I've used mine to save some folks in certain situations by converting their bike to single speed to continue riding.