I wasted a season fishing a stretch of river that looked like it held fish, only to find that they were so thin on the ground, no-one bothered fishing it.
Firstly, I'd make sure there are fish there. Get some polarised galssses and drop some bait in areas where you can see it. Sweetcorn is good for it as it's bright.
Go chuck a few handfulls in some of the slightly shallower areas and see what happens to it. It might be instant, it might take some hours.
On warmer days, get some floating crust in. I've had the chub on my local river coming up for surface baits for a few months now. It's a great way to suss out where they are.
Once you have worked out if the fish are there, as said, either trott your baits down if the bottom is clear, or feeder if the bottom isn't so clean.