I've been working on a model for betting game totals on soccer matches. After a month or so I am doing well enough picking winners to think I am on the right track, but am having trouble nutting out a way to calculate what the fair odds should be.

I've only handicapped motorsport up until now, so these 2 option markets are new to me.

Any hints about a basic methodology, what to read (online preferably), or where to get started greatly appreciated.