If it’s a small one-train-per-day branch, where do the through freights come from and go to?
I’m a big fan of yard leads for most model railroad situations, but if it’s truly a one-train-per-day branch, you probably don’t need one. They’d just use the branch track, since there are, by definition, no other trains. Also, there wouldn’t typically be a dedicated switch engine at a branch terminal that sees only one train per day – the road crew would do the work with their engine (unless there was a large industrial complex there, for example).
Likewise, you don’t need a dedicated caboose track if there’s only one caboose and it comes and goes with the branch line train. But maybe I don’t understand well what you want the yard to do.
You might receive more useful help if you post a sketch of the overall track plan as you conceive it at this point – even if there’s just a blank space labelled “yard goes here”.
The arrangement and operation of a yard depends greatly on the rest of the layout it serves, so without that information it can be a little difficult to give helpful advice.
You might also want to refer back to an earlier thread on yards in which you participated – some of your questions might be answered there.
http://cs.trains.com/mrr/f/11/t/200156.aspx
Best