Karen, with oily hair you need to always shampoo your hair 2 times..and leave it on for 5 mins, which is easy to do in the shower. You should always choose a clear shampoo...nothing is added..and do not use conditioner.
You can squeeze 2 lemons and add the juice to a quart of water for a rinse.
Or you can make an apple cider vinegar rinse1teaspoon in a pint of water...this is a finishing rinse .
Do not overbrush your oily hair, keep your hands off of your hair...no hair playing.
Also you can blow dry you hair in the opposite direction it grows..To force more coarseness in it so it is not limp and laying flat on your head
Hope some of these tricks help.

janet