Hello! Sorry I'm not an interior design person, but I can offer a few tips. I sometimes get ideas about how to solve house design issues from near neighbours. Estate agent websites will also carry lots of pictures of houses in your area. Take a look at how other people have styled similar homes to yours.
The main thing is to be sure you're drilling into a reliable surface. I've had to have shutters installed in our front room because the plaster above the window is so shoddy. On the pole or track question, I'd opt for a pole purely because it sounds like you have a long length of curtain to hang and I think rails can get a bit overwhelmed by the weight.
It's a Victorian house and the window architrave is level with the picture rail. Currently, the curtains hang on poles which are screwed into the architrave, but this just looks a bit...mean. I feel that the curtains should be hung higher and wider to make the most of the window, but how and where? Right up at the ceiling, on a pole or track? Or a bit lower? And then do you need to cover the track with a pelmetty thing?