Just think of it like a lathe turning a bar but 'inside out' and using a rather long tool sticking out from the tool post more than usual. So you calculate the speed for the appropriate sfm for the material or look it up on a chart for diameter. And depth of cut appropriate to the thin wobbly tool. However don't be too timid and make sure you are feeding it down fast enough not to end up rubbing. This is the equivalent of the automatic feed rate you set on your lathe so wants to be in the range 10 down to 1 thou per rev.

I suspect you will find out by trial and error that the limitation is often rigidity, aka judder. If you want a decent finish, even with a razor sharp boring bar you may be limited by the realities of a necessarily large overhang and a relatively compliant body. As Bayzle says you also need to take a decent cut. So minimising overhang and using a sturdy, short boring bar are key. Note that adjustable heads can be tightened up between adjustments.