For rapid prototyping : a 3D file (or failing that a drawing or a dimensioned sketch), the quantity of parts and the type of finish required; if you know them, the required technology and material, if not the thermal, mechanical, dimensional, etc. stresses.
For digitising : send us the item to digitise or at least photographs taken from different angles and its size (x, y, z).
For your price enquiries for injection and moulds: STEP or IGES files, the life required from tooling, injection material, type of mould (pre-production, short run, prototype).