Project Managers

Detailed Project Description
Your project description should be as detailed as possible. It's better to have too much information than too little. Some people choose to summarize the project in the description field, and attach a file with more detailed info (for interested bidders). Which is a good idea.

Additional Features
If you have additional features you would like in your script, which you did not mention in the project description, please tell the freelancer BEFORE they begin work.

Request Demo
Before you pay for the script, you should ask the freelancer to setup a demo (on their server) to make sure it functions as you requested. Once the freelancer sends you the script it could be too late to cancel the project, and you will be expected to pay for their service.

Payment Method
Before the work begins, you should discuss with the freelancer how you will send payment. Indo Projects suggests puting money in an escrow account.

Freelancers

Know The Project
You should know how you will create the script before you place your bid. If you need more details, post on the message board for that project, request more information from the project manager. If you don't, at least make sure you are clear about the project before you begin working on it.

Updates
You might consider updating the project manager on your progress throughout your work, especially if it's a long project. This will assure that there is no confusion over how the script is suppose to be when you finish it.

Provide Demo
Before sending the script to the project manager, you should setup a demo (on your server) so that they can confirm it is what they wanted done. You are almost guaranteed satisfaction if you do this, because the project manager can see the script working before they receive it and pay you.

Payment Method
Before the work begins, you should discuss with the project manager how you want them to send your payment later on. Indo Projects suggests that you ask the project manager to put money in an escrow account.