John,

You do have a lot of credits to add. The good thing is, the entry of all the other credits will be basically the same.

When you have a episode or film with no credits yet, you still enter your credits the same way. Your credit will just be the first one.

Keep one thing in mind. The music credits should be in the order that they appear in the film. I know it's a difficult task without having the cue sheet.

Best!