At Without Limit Freelance we provide you with these useful tips
Describe your project in as much detail as you can reveal, this will increase the quality of the proposals you receive and shorten the selection process.
Upload as much relevant information (images, documents, specifications, links, etc.) as possible to get a realistic quote.
Clear and concise information creates parity between the level of experience and your requirements; remember, you are looking for the best you can afford, not the cheapest you can get.