I generally us bottom trim at the bottom, d-2 trim or similar at the top of the wainscot, and in the corners I use J trim. I put up the steel liner all the way into the corner, then **** the j trim against it to start the next wall. Doing it this way you will end up with j-trim on the sides of half the walls...
There is also an inside, and outside corner trim that I have seen be used. I don't think it looks as clean, but others have told me I am wrong
Check out the menards site, and go to the building material department, then the post frame materials. They have nice diagrams for most of the trims showing how things go together.