Create app/design/frontend/bstheme & skin/frontend/bstheme

Copy all the files in the theme folder (app & skin) default/default into bstheme/default

Download bootstrap 3.0 and copy to bstheme skin folder
Create app/design/frontend/bstheme & skin/frontend/bstheme

Copy all the files in the theme folder (app & skin) default/default into bstheme/default

Download bootstrap 3.0 and copy to bstheme skin folder