The six essentials
(1) product or category; (2) amount and unit; (3) desired packaging; (4) delivery city and receiving point if known; (5) desired date or potential delivery schedule; and (6) relevant specifications or documentation needs.
Why the unit matters
Individual packs, cartons, weight and liquid volume are not interchangeable measures. If you have not chosen a packaging unit, identify the uncertainty instead of creating a false precision. Likewise, a requested delivery date is not confirmation that the supplier has accepted it.
After receiving a response, compare the same products and units, including delivery and commercial terms. Record where a seller needs clarification.