My friends are basically hosting a club event and we need to make some promotional flyers. Does anyone have experience in print?

My friend found a place that makes the design and print, 400 copies for $175. But that's way too much, we only need like 50 flyers and I'm very good with photoshop so we are thinking of just color laser printing it at something like 0.25 per a copy on 1 side.

Any clue at a proper resolution and DPI? I'm guessing start at 800x600@300DPI and resize it to 400x300@300DPI. Any suggestions? Thanks.