I will hopefully be starting a campaign with a couple of friends on Sunday. One has played a few stand alone missions and the other has done nothing. We will be doing the Core Campaign. What is the consensus on which modifications?

Should I reduce the cost of Luke, Han, and Chewie? If so by how much?

Should I increase the amount of Item and Supply cards since we have gotten so many more? (I have all of the box expansions.)

etc...

Add all of the components from your expansions to your existing campaign components, following the instructions in each expansions rulebook.

In my opinion, you can use the following point values for Han and Chewie and it works fine. This is what they're costed at in my campaign.

Han: 8

Chewie: 10

You don't need to worry about ally costs unless the heroes actually win them as allies.