Data plans

I'm getting an iPhone 6 and and I'm going to be getting a plan with Verizon. I need to figure out how much data I need. I spend a lot of time watching YouTube, maybe an hour or two a day, and I'm also on social media a lot. I'm at home most of the day and whenever I am I use wifi, and I do have wifi at school. Does anyone have a rough estimate of how much data I might need? What I would mostly be using the data for is Pokemon Go, and checking social media. Thank you!

 

This will be my first phone, so I don't have a plan right now ^^;