How do you conditionally send mail?

How do you conditionally send mail?

Okay so in my application I have two forms one to add subscriptions and the other to add subscription types.  The Add subscription type form has options to allow the user to select whether he or she wants to email the subscriber and email the team leader. Then once a subscription is added the respective emails should be sent out.  But those vary with each subscription selected.  The Type is a Lookup field (ds name Type), the Email Team Leader field is a dropdown list (ds name Email_Team_Leader), and the Email Subscriber field is a dropdown list (ds name Email_Subscriber).   So what I need is somebody to tell me how to set this up. Please help me on this!

Thanks,
Michael McNeill