Centre stand, checked first thing in the morning (no running it first - I ride home and park it on the centre stand)
Unscrew it, wipe it, and just sit it back in the hole, without rescrewing. Pull it out and check it. (if you filled it to read 'full' on the side stand, it'll be too high to read correctly on the centre stand, so empty a little out.)
Full synthetic motorcycle oil (motorcycle engine oil is also the gearbox oil - so has a much harder life, and needs to be specifically formulated)
Also, check for NO friction modifiers, telflon and the like, as they cause the wet clutch to slip.
Change the oil and oil filter every 6000mi (10000kms) and you'll be golden.
Cheers,
Rick