Bruce,
For topping up purposes you can be fairly relaxed about the choice of oil, as long as you aren't putting more that 0.5-1 litre in.
Any decent full synthetic oil will do the job. Ducati specifies a 15w/50 viscosity but you can use 10w/40 too.
Try and buy it from a dealer or even better, a major store chain like Asda, B&Q etc. Petrol forecourts charge top whack for all their products so you'll pay over the top for Shell Advance there even tho it's the most obvious place to start looking.
I use a small funnel and a piece of garden hose to help get into the filler hole ......leftovers from my collonic irrigation
Be careful not to overfill the sump. Add a bit at a time and let it settle before adding any more. Top it up until the level is just below the higher of the two marks adjacent to the sightglass on the RHS of your crankcase.
Any probs, just shout.
Have fun. Guy