Tune to open G and experiment with chord runs; lots of open strings and barres. Three/four finger shapes. There are no hard and fast rules.
Someone should make a teaching vid - are you listening Mr Traum et al?

Don Ader

You might want to try this site; he's a superb player and probably be able to furnish you with a few pointers.

Failing that- go to a (good) Irish session and enquire within.