My iPhone and iPad are set up under the same account and when I try to FaceTime with the iPad or vice versa it says face time is busy and will not connect, how do I fix this

Because that's the equivalent of trying to call your home phone from another extension in the house... If you want to be able to facetime between them, you need to activate facetime using different e-mail addresses on each one.

I can call my ipad with my iphone alll the time. That's how I check up on my kids at home when I"m at work. You just set up to your iphone's facetime setting with your phone number and set up your ipad's facetime settings with your apple id (in this case it's your email)