Most all powdercoating temps need to be around 360-365 degF and that's for all metals . For beginners you want to have a good digital heat gun so you can see how hot those temps are when you pull the piece from the oven. As you know all ovens are not the same and they can vary heat.
You also want to pre-heat the parts, about 15-20 minutes, so they can allow for out gassing, especially aluminum parts. You heat the part to temp and then apply powder. The powder will start to melt and then you put it back in the oven for another 15-20 minutes.
If you do not out gas the parts, what happens is you apply the powder and little bubbles will pop on the newly applied powder.