Looking for - help/tutor with 3d scans into Game assets. (Clean up)

As the Title describes, I’m looking for someone that could either help point me in a good direction or has time to help tutor me around and see what i’m working on. My blender skills are still beginner related, but I have the navigation and an average of the shortcuts down.

I’m basically recreated skate spots for a level i’m working on, my meshes come out choppy and i’d love a way to reduce the poly count on some and clean them up so they don’t have spikes everywhere.

I’ve watched hours and hours worth of tutorials over the last few days. Which helped my overall status now. Just haven’t found the right one that works for me yet.

Thanks for your time.