how would i go about making dirt piles like where a riser could spawn?

Can't help you with the risers, but there are KVP lists everywhere for those (I know mods repository should have a page on it) but for the hill, this should help (this is a tutorial series on terrain patching in general. I would learn to use this ALOT if you intend on having rough terrain in your map)

Advanced terrain series : Part 1: Introduction, basic patch creation, theory and approach.

Good luck, hope this helps!

thanks a whole bunch