Sewing a dress involves many essentials to make it worth the expense and pleasure of completing a "work of art". When you have decided what colors best suit you, what lines are appropriate for your figure, what accents or details you like, what seasons you will wear the garment in which would determine your choice of fabric, and what you are willing to spend in money and time, you are ready to begin. The best beginning would be to make a muslin sample to see how the pattern fits and what adjustments need to be made.
There are quite a few online sites to help you figure your body shape and what best would work. I like the shapes that "Joy of Clothes" offers in their body shape Overview. From there you can choose which one best matches you and get some ideas of do's and don't's.