Q:

Is there an alternative to a purchase order that sellers can use?

The only thing I can find is a sales order, but the problem with that is it isn't legally binding. To be more specific on what I mean:
Say that we want to sell someone business cards that includes a specific amount of time for graphic design.  And we want to get paid after the graphic design, but before printing.  Is there a way before graphic design starts to have a client binded to an agreement that they'll pay us for work done, and if/when design is approved, printing?
I know a contract would work, but for something as common as business cards - it seems like overkill and would put people off.  Purchase orders from customers would be great, but most of them are too small to use them.  Are there any options that are simple like a PO, can state a list of terms, and be very easy for customers to get through?
Every contract we've had written has been so long that customers don't fully understand the terms.  Simple is better for a quick job like this so they DO get the terms clearly.

A:

There's a tradeoff in written contracts: The more precise and comprehensive, the longer they have to be.
The basics of a contract are described here, and it's possible to have a legally valid contract without writing anything at all.
But the more you care about avoiding ambiguity and covering "corner cases," the more you need an experienced attorney to write your contract.
You can ask an attorney to avoid "legalese" to the extent possible, and to try to make a contract as "easy to read and understand" as possible.  Some are better at that than others.

