[Create A Poster for Barbers]

@Wonderings My Camera I've been using is a Nikon D3200 SLR. Its has 24 Mega pixels and a 35mm 1.8 fixed lens so I save all my photos in the normal file size at 4mb unless i need a higher resolution then I will increase the size. I can post a sample of what Im working on so yo can see what i'm trying to accomplish 

[Create A Poster for Barbers]

How do I add numbers to every photo?

[Create A Poster for Barbers]

Thanks this was Very helpful!

[Create A Poster for Barbers]

Im Creating a Poster for my barbershop and Im putting 30 photos of customers that I and my co-worker has cut. The Poster will be 36'' Height x 24'' Wide. and I know the photos need to be in a High resolution to fit 30 pictures. My canvas size needs to be how many Pixels? What I want to know is there a way I can put numbers on every photo so customers can identify what style there after? Is this possible with infinity designer? or Infinity Photo? because I have both on a Macbook. 

Please help