surface on CAD softwares

I have watched plenty of video tutorials on youtube and noticed that almost all of them make their design based on blue print. So, I was wondering that its not possible to make complex design without blueprints or what should be the design flow ?

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It depends on the company, but a lot of times it goes like this:
Someone in charge says something vague: Make a new X. It has to be Sleek, Powerful, Lovely, Red, Stylish, and Warm.

An industrial designer, or artist could then spend time sketching concept models. These sketches are all about the major lines that define the shape, appearance, and overall feel of the product.

Once the shape is drawn, then there can be arguments about the color, texture, materials, size, shape, and everything else.

Finally, everything is tossed to the engineer with instructions to "make this". They do their best, but often the "design" can't be manufactured as drawn, so changes and compromises are required.

With a CAD model, it is prototype time.
The prototype is evaluated. and changes are made to the CAD model.

Finally it might be time for mass production. Tooling, shipping, packaging, assembly, materials, warehouses, distribution, and a hundred other factors are decided upon and placed on order.

Keep your fingers crossed that everything works!

 
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A lot of times "someone" like a graphic artist or illustrator will generate the initial design sketches of an object.
I'm sure many "engineers" could sketch the lines, but many times Engineers rely on things like lines and arcs.
The Artist's lines follow their own rules and definitions. Many times they are elliptical, conic, or a spline.

By "tracing" over a line, it allows the final product to look more like the concept art.
That may not mean it can be produced, but at least it looks like it should.

As a broad simplification:
Left on their own, Engineers would tend to build rather utilitarian designs (i.e. a Jeep). Industrial designers give us the curves found in a Porsche (and other cars).

 
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Usually product designers make sketches of the new product they are designing, or if the making anything new in an existing product. Making sketches is the easiest way to represent your ideas. You will get a feel of the product about how it'll look, how good it is to handle etc etc. This also become a benchmark for your further CAD designs.
Starting a cad from scratch, you'll face many challenges ( especially in surface modelling).
Take a look at my model of car which I did without any blueprints. It doesn't has that appealing sense in it ( I'm downgrading my own work, but truth needs to be told). But still I can make the cad much better now, since I have a benchmark cad and now I can change the features to make it more appealing. This process will help lot of time. First I made a cad and I change it. Comparatively having a sketch or blueprints save a lot of time.. more efficient and quick.

 
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