I know it has to be 5 men and 5 women on the field, but does it matter where everyone plays? It doesn't have to be man - woman on defense does it? It's been a while since we have brought our team from WI

It does not matter what positions a person plays. You can position your players as you like except in the batters order where it has to be man-woman-man, etc.

Do the men bat straight up in co-ed?

yes, men bat with a 12 inch ball and ladies with an 11 inch

When a male player walks with less than 2 out, does the female walk automatically, or does she have to hit?