Le't start with the basics.
Real World.PNGNotice that there is a problem with your Extrude1.
Right click on it and Delete it.
Delete everything after Extude2 (not needed). In the real world this would be one part number placed two instances in the assembly. Model it that way. one ipt = 1 solid body, not 2 (until more experienced, then we'll talk about multi-body solids to make the entire thing easier).
Edit Sketch2 - it doesn't have enough dimensions to manufacture. I recommend you start here http://home.pct.edu/~jmather/SkillsUSA%20University.pdf
Once you have fixed the part - attach here.
Then we can see how to apply assembly constraints.