hey! this looks good for yor first model.to add bump map, this is really not hard.all you have to do his go to you material atribute(right click-material-material attributes...)you will probably see bump map somewhere.click on the little checker icone next to it and click on file as you probably did for your color map.then you will see two things named:
bump value-
bump depth-
you will see a little arrow next to bumpvalue, click it.after, you click on the folder next to image name and you choose your bump map file.if you want to change you bump depth, you will have to ask someone else because i wont be able to explain it as english is not my main language.

to create a bump map, just go into photoshop,open your color file,click on image( on top of your screen), mode, grayscale.you will have a bump map.there is some others way to create a bump map but its the baic one.

hope that helped.