correct installation of entry double doors

[jelj360]

hello everyone,

Can any one tell me if the strip of wood covering the join between double doors should be fitted on the interior or exterior- and what is that strip of wood called.

Also what is the overhanging strip of wood on the bottom of the doors on the outside called, and should it be cut vertical at the join or at an angle

hope this make sense to someone, im no expert as you can see!