If you are handy with your PC, you might also consider purchasing special computer software that will let you design wood decks and see how they will look. If you decide you like one of them you can print out a copy of the plans, as well as a supply list - and take both to your local DIY center, or give to your contractor, to get the necessary materials.
The basic requirement for all good wood deck designs is that the design and construction methods meet all local code ordinances for proper construction. Your wood deck design should also specify the use of good-quality materials (lumber and hardware). Lastly, and most obviously, your wood deck design should fully meet your needs. Feel free to discard design ideas if they won't work for you.
Make sure that if you will be using your deck for special purposes - such as entertaining, or for the kids - that your wood deck designs incorporate areas for any special equipment (such as a barbecue, bar, hot tub, sandbox, or area for sunbathing).
Once you have the general idea for your wood deck firmly in mind, then it's time to develop specific design plans. You can adapt and use a wood deck design pulled from a book or magazine article. You can also use special computer software to draw up your wood deck plans - and then you can print them out. If you want to make sure that your wood deck design is a sound one, you can hire a professional: a contractor or designer.
When getting an estimate from a contractor for your wood deck design construction, you should insist on a written estimate. It should be a complete estimate of all costs. The estimate should also specify the cost of materials separately from all labor charges.
Of course, the wood selected for your decking project should be able to last for years exposed to elements. You will need to use pressure-treated or preserved wood. Don't waste money using plain lumber as it will not last as long. Properly treated wood will also help preserve your wood from insect infestation and decay due to moisture.
As you work on getting various written estimates for your wood deck designs, you will notice, of course, that labor charges can vary significantly from contractor to contractor. If materials charges vary significantly from one contractor to another, compare the estimates very carefully to make sure that a contractor is not trying to use cheaper materials to lower the cost, or increasing their profit margin by charging a lot for using cheaper lumber and hardware.