2. What file you need to prepare if you want to get an quotation from us?
For PCB board, you need to prepare files of Gerber file,it should including RS-274X,ODB++, DXF, PCB, PCBDOC etc formats.
For PCBA(PCB with soldered components), except the file for PCB, you also need to
prepare the BOM list (components list), Pick and Place file(txt format), real sample pictureor 3D PDF version file etc.