Yup you can't ask for an order & price while the whole product design is unknown, telling the specs to the manufacturer isn't enough, there are a LOT more steps involved if you want any product to be manufactured:
- Decide the process for plastic parts (molding, cnc, 3D printing..)
- Decide which materials (ABS...)
- Draw all parts in a 3D CAD software so you know all dimensions of all parts
- Find and source all existing components you will use (jack, connectors etc.),
....
If you want people that will design everything for you I don't know where you should ask, but it's probably going to cost you tens thousands of dollars...