First line not indented on compile

So, my agent tells me to submit my novel with the first line of each scene not indented but every para after that indented. This is incredibly standard, of course.
First para, no indent, subsequent paras, indented.
So how do I set this up when compiling? Surely it’s pretty standard stuff?
If I have to do it manually, it means I have to do a few hundred adjustments AFTER compiling (I don’t want to write my novels in book formatting, thanks).
Anyone done this? Any ideas?