When you get on to photoshop you go to File new 

 

 

When you get to this you click preset then click international paper

size: A4 and 300 inches

 

Image, Image rotation and 90

i clicked on view then show grid then started to drag my pictures on to photoshop out of my album

When i got my pictures onto photoshop i had to adjust the sizes to match each one

 

i had to make sure each picture was the same size this is why i used

my grid to help me do this.

once i got all my pictures into photoshop i lined them up so they would all be the same size

once i had finished i clicked view show grid again so the grid would go

and then i could see my final piece