Can you edit the number of games per season?

I want to play 58(?) games during the first year of my dynasty then afterwards (2nd season onwards) play just 29 (play each time once). Is this possible? What do I need to edit to do this?

I think you can change it when you complete a season.
When you get to your second season and you have training camp etc. go to 'Settings' and then 'Dynasty Settings'.

You should be able to change it in there.