Basic graphic design question for a print work

Im going to make a 185 cm x 60 cm banner for my work, but I want to know if Im doing things okay…

the guy in the print shop told me to make the banner in the original size with a 170 dpi, ok then…I open PS choose new file and now I want to add a picture…this picture has a resolution of 300 dpi and is 1536x2048 in its pixel dimensions…so…I put the pic inside the banner canvas and of course is tiny in the whole canvas…I make the image bigger to fit the size of the banner, and it appears to look good so far, expect if I zoom the banner to 100% which looks bad…

I want to know how Im doing so far if Im missing a step in this process…?? or something I should know

Thanks! berk