Marking macro with a mouse

[Kimura410]

I use a gamepad on pc and don't use my mouse much. If possible, Id like to create a macro that when I click a target, it begins the marking process. If theres a single target, it just marks it as 1. If there are 2 targets, then it goes through and marks 1 and 2, and so on.

Im really bad with making macros so if somebody could help, that'd be awesome. Also, since I am a scumbag gamepad user, could I add additional abilities on my screen? So I have my cross hot bars from the gamepad, but basically I just want to throw my finger sandwich button on the screen somewhere so that I can click it mid battle, instead of pressing start, inventory, clicking on the food.

Not sure if its possible, but if its very simple, forgive me, Im pretty dumb.