In this video, I'll tell you about the Flat Pattern method of pattern design (which is what we use at ClothingPatterns101), and about the importance of the basic block.
In the video above, I reference pages on the website that offer more information.
Here are links to some of those pages:
Using a commercial pattern to create your block
Fitting the bodice
Fitting the sleeve
Fitting the skirt
Transferring the fit adjustments and making a block pattern
A Beginner's Guide to Drafting a Dress Block (from measurements - available for purchase)
Time to get started on your dress block, whether you use a commercial pattern or draft it yourself!