Need to put my kymco cobra bake together from scrath

Buy a manual. It will save you money in the long run. When you say "From Scratch" do you mean a complete engine rebuild as well? If so you would be better buying a different bike and doing a rebuild in slow time. The only reason I say this is that, if you have you ask for advice in a forum before you have started, then you don't have the skills to do the job quickly.