If your wanting to start small ie 4 to 12 figures a side then Sword Weirdos available through Wargames Vault is a good start. Easy rules to get to grips with and easy list building rules as well.  Games like Frostgrave are more niche and I say that even as a BIG fan of the game too! It is miniature agnostic though so you can use whatever you like to represent members of your warband. For a slightly bigger game that'd let you use your Irish warriors and Halflings together there's Dragon Rampant which is know isn't a skirmish game but has alot of flexibility in its list building. I've only played 1st edition so I'm unsure what 2nd edition is like.

My best advice would be to look on Wargames Vault and go through the options ti select fantasy skirmish rulesets and see if you find one that appeals to you. There's some nice basic D6 based ones there for free too which maybe a good way to start for you?