I think you won't be happy making this project if it's your first time sewing. Collar, cuffs, patch pockets, buttonholes...these don't make life easy for a beginner. Sorry that's not great news. Just get some practice in you before trying this jacket. The pants would be easy if you cheat and make them pull-on pants instead of button & zipper.
As for starting to sew, get some books on it from the library. Make sure they have lots of pictures to help you along. The books will teach you all the jargon so that when you use patterns, you'll understand what the instructions mean.
When you're ready,hHere's a possible pattern:
http://tinyurl.com/b7opju
Ignore the loud fabrics in the examples, and scroll down to the diagrams. It has all the elements and the boxy shape. Increase the number of pockets to 4 instead of 1 and choose a heavier fabric.