Baldrich
Thank you very much! Now I rethink your explanation and more becomes clear for me. You really helped me.

2. So, I order 7 * 9 Further, when getting my order, I make a stencil and cut right to me. Do I understand correctly?
While it may better to order a smaller size 6 * 8?

What will be better with that hairstyle - A, AA, BB?

3. This will be the best option? I heard it flatback made specifically for this hairstyle, but there is no flatback on site.

4. If I order a 90% - it will be not so realistic? Or I should order less density? What is your opinion.

6. What kind of glue and tape and you would advise me on this site? And also the solvent.

8. This mean a mail envelope by classic post? Ok, probably I think about it.