Hi sallyann
This is how I did my aluminium pans:
Wash with hot soapy water.
Dry it and then coat it with vegetable oil (pour the oil onto a paper towel and work it well into all the surfaces).
Put it into a preheated oven (250 degrees) for two hours.
Never use scouring pads or detergent as it will take off the seasoning (just wipe out with a cloth).
If food ever starts to stick to the pan, just season it again.
(avoid putting it through a dishwasher at all costs!)