Easy. First subscribe to all the mods that are required in the workshop (He has a list/link on the main page of Scrapyard Enginners mod).

Second, make a new game and select the middle tab (ones for modules), not scenarios or the other one.

Then select Scrapyard Engineers and launch the game.

You can also look for "how to" videos on youtube. You know, you google it and watch the videos on youtube? Pretty easy and you do not need to wait for an answer on a forum. That is how I check up stuff. I do no need to wait for anything and I get my answer now. ;)

Wondering if op got it running? Would love to try playing this on a server and not sure how to go about finding one. (It's getting lonely in the wasteland!)