If I play an Action that lets me play another Action, such as
Confidence, does that Action count as the extra one that Menasor lets me play?
[Source: WotC] 
No. If another card lets you play an Action, that won’t count for Menasor. You can play that Action and then another one for Menasor.
I have Menasor on the field and two
Team-Up Tactics in my hand. If I play them, do they do nothing, am I forced to pick one effect, or do both effects go off?
[Source: WotC]
Menasor is not a truck or a car, so
Team-Up Tactics would have no effect on him.
I am playing with
Metroplex, and I have
Backup Beam and
Debilitating Crystal attached to him. My opponent has Menasor equipped with
Stunticon Swagger. It is my turn, and I play
Height Advantage to get the extra bold 4 to try and activate Metroplex's triggered ability from card flipping. As I declare him as the attacker, and Menasor as the defender, Debilitating Crystal activates. I choose to bounce Swagger to my opponent's hand. Does my bold then become active because the effect of Swagger is no longer active? Am I allowed to use the bold from the upgrade and the action now?
[Source: WotC]
Yes. Both bold effects would apply in this scenario.
Stunticon Swagger does not stop a character from getting bold prior to the attack.
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