In regards to the fight, think not only of the reason for the fight, but also the reason why the characters are fighting. I had that conundrum a while ago when I was writing a fight scene but couldn't make it interesting, till it clicked that the mc was fighting without a clear reason to.
If the mc's friend was hurt or if the mc wants to gain a level or if the mc wants to impress his/her crush, they have a reason to fight, which dictates the way they fight - are they angry and reckless, cautious and calculated, or flashy. When you have that, your fight scenes will automatically flow better.
As for locations, the best advice I ever received was to describe as little detail as possible. You don't need to write three long paragraphs describing how a place looks and detailing every part of the landscape - it's much better to write a much shorter description consisting not just of descriptions, but more importantly impressions.
For example, if you have an image of a cliffy coastline, you shouldn't try to describe each part of it. It's enough to write for example that (pasted from one of my fantasy stories):
No more than five seconds later the surface of the planet becomes visible, and after a while the jet flies out of the cloud, revealing the sun-schorched stone in all it's glory. We are flying exactly along the frayed, dark orange coastline, with dark blue waves of the ocean gently breaking on the massive rock formations jutting out of the water. They resemble slabs of stone layered on top of each other and weathered by time, but their sheer size is simply incredible.
Each layer has from a few to hundreds of meters in height, and some of the cliffs they form are over a kilometer tall, maybe as much as two or three kilometers at the tallest drop in between two crevices water flows through.
Those two paragraphs are all I wrote to describe a whole coastline. There are no details here, but it allows to easily imagine the whole thing without forcing readers to create a detailed mental image that will become completely irrelevant in the next half of the chapter. The same advice applies to all other locations, even rooms.
