DAW setup

I'm looking for help getting Reaper up and running.
I have a new interface and midi controller and Reaper is correctly installed because I'm able to record voice and guitar and even one synth plug in.
But I can't get general midi instruments to play; the software is complicated and I'm simply not knowledgeable enough to get the ins and outs properly assigned.
If you can do it, let's talk price.
I'm 40 min.
SW of Valley Station in Breckenridge county.
Thanks