i used hatch and invisible box in door windows selection when importing but they just dont create a whole on wall?!?!

You probably forgot to check the Door or window check box during the 3rd importing step. Only doors or windows can make holes in walls.

i did read the how to make a dormer how to make a dormer. i cant see TOOLS section on my sweet home 3D !!!!

You probably forgot to install some plugins as mentioned in the introduction. I feel you want to go to fast. I you take your time to read manuals entirely (they are not so long), you'll get many answers by yourself.