Before the season starts, bookies nearly always go to a large extent on last season's form. They also have little knowledge of non-league football, so they just look at league tables.
I think the odds on York are pretty fair, as we have no experience of non-league and have just released virtually an entire first team, because we can't afford to keep them. Next season we will be full of kids and free transfers, who will inevitably take time to work together as a team. Your team has been together a while and won't need to do this. The one advantage we'll have is that we'll be full time, and I expect a mid table finish because of that.
I'm not surprised that Carlisle are favourites as they've built a useful team (after it was too late to finish outside the bottom two) and will probably get excellent gates. I quite fancy Steveage as well.