iPhone 6 mirroring without internet

Good morning,

I am wanting to mirror my phone to my tv (I do not have a smart tv) I purchase movies or tv shows on iTunes and download to my phone and want to watch them on tv.

What is my easiest, cheapest option to make this happen? I have a hotspot I can use to do a set up of some sort if I am needing to get an Apple TV box but I am just not sure how to go about this.

Thank you!