Hey,
I think that's a relatively unexplored genre in Construct; but the general concepts of game making in Construct apply, so following some tutorials and such will give you alot of tips. There's been plenty of platforming games made, some involving fighting, so the uploads forum would be a good place to look at some of those (if they can be modded to what you want..)
I'd use the bone movement behavior - documented on the wiki - for the character; this'll save you countless hours drawing and animating animations, as well as giving you an easy way to add complicated attacks.
Good luck.