Photoshop Help-Blending

i just want to know how to blend more photos into backgrounds, like how to u use the smudge tool?, i just need help on blending two together, if u could help me out with that that would be hella appriciated.

just give me exactly on what i should go to on each cuz i have no clue on making new layers and putting two photos to blend better, much much appriciated if you could.