How to go about making clothing.

I have been looking at youtube videos that demonstrate various methods of making clothes here are some:

This one is for summer dress making:

http://www.youtube.com/watch?v=jsSZTHyCLyU

This one is for a blouse:

http://www.youtube.com/watch?v=gO9m2YQ1UNQ

Ruffled skirt:

http://www.youtube.com/watch?v=q2ntDIHHz6E

I can use these demonstrations as an outline for making my clothing range although I am aiming to make something original so will try to make different designs. Most methods I have seen involve sewing machines.