I've just finished designing my first PCB, and I'm about to send out a batch of emails for quotes from manufacturing/assembly shops. My design is super simple: the only components are 7 identical SMD resistors, a 5v voltage regulator, a decoupling capacitor, an ATMEGA328P-PU and 16 pads for off-board wires. I'm looking to do an initial run of 50 boards, with the possibility of ordering more later. I'd also like to receive a prototype to verify that everything works properly before putting in a purchase order for 50 more boards.
I'm very new at this, and Google provides an overwhelming number of shops to choose from. This post seems to have some good advice for ensuring quality, however it seems that such a small, simple board wouldn't fall prey to many quality issues.
Beyond the advice in the above thread, does anybody have any recommendations for what I should ask in the email? And further, if anybody has any suggestions for particular shops to reach out to, I'm all ears. Less expensive is better, but not at the risk of receiving defective boards.
Edit: Also, would you anticipate that it would be dramatically less expensive to just solder the boards myself? And if it's worth it to have the PCBs assembled, is it more or less expensive to let the shop source the parts themselves? I'm not sure if they would get a better deal on the parts, or if they would be overcharging me for them.