There is only dispersed information about how to create a new Photofield for an airport - search the forum for "Photofield" and similar terms. There were some very detailed posts about how to create and use a background photo not too long ago. Getting one that represents well can be a good amount of work, with many retries until you get it. Here's one brief post that may give a sense of what is needed:
https://forums.realflight.com/index.php?threads/hillbilly-field_pi.56656/#post-356816
I've never actually created a complete photofield airport - between getting a good photo background, mapping collision fields so you don't fly through things (buildings, etc.), and the rest, it just was something I had a hard time understanding. But many others have done it very well, so that is just me. I greatly prefer finding a spot in the 3D world that gives distant vistas close to what your real has, then placing all the objects similar - runways, dirt roads, parking areas, trees, bushes, flight stands, shelters, etc. The compromise is that while RF has a huge number of objects you can place, some may not mirror what your field has - flight stations may be different, shelters may be different, etc.
With either approach, expect to spend a lot of time in the Airport Editor learning its quirks, and "how to's".
