Add 3 email notifications

I need 3 email notifications added to a micro job script. 1) When a job is purchased the buyer should receive an email confirmation 2) When a job is accepted by the seller, the buyer should receive and email notification stating "Your order was accepted" 3) When the buyer or seller post a message in the project message board the other should be notified "you have received a new message in the project message board". I need someone who can do this immediately, my budget is $30