Setting up the Table of Content

I type lots of word document and after i finish i try to get word to number them for each chapter eg 1.0 1.1 1.2 1.3 1.4 or ant other format, but i just cant seem to get word to do this.

this is even worse when i try to use diffrent headings to diffrenciate sun titles from main title.

i use the Bullets/bullets and numbering key on the menu. Can anyone advice.