I think that much of this applies to flogging as well. Obviously I am assuming consent here. If there's bondage involved - obviously safe words are a requirement as well. The following discussion might be better on the BDSM board but...
Spanking is hard work! I highly recommend the use of a flogger - your hand can get pretty sore. Further, you can use a flogger much more delicately than a full hand - which means that you can deal with the pussy, belly, tits and legs.
Spanking while fucking is pretty tough - if you can really keep up a good spanking in wheelbarrow --- my hat is off to you. In wheel barrow, I generally have both arms occupied. I have found that the worm (basically starts as an RCG where she goes completely forward and ends with her chest on your knees) will work best - but it still ain't great.
I find it really tough to keep control to do flogging or spanking during actual intercourse. The positions are generally pretty awkward for that. You really can't do the dom thing if you can't maintain control.
I think it is much better to have the spanking/flogging separated from the fucking - though obviously that is a matter of taste. If available, spanking benches and/or a St. Andrews cross are the "gold standard" for this. You can, of course, improvise.
It can help if the sub will tell you where on a scale of 1-10 you are. Different subs have VERY different tolerances. and expectations.
Another interesting twist is to have them count down...and get pretty hard on the last one.
Intersperse the spanking with caresses. A vibrator can be a lot of fun as well. Possibly put them "back to work" for just a bit.
Don't underestimate the power of a blindfold - especially if you are flogging from the front. But even from the back, the sensory deprivation is useful.
Thanks for the topic - I haven't seen this one before