EndNote ships with thousands of styles and more are being added every day.
If a style is not in your EN program you can choose to find more styles from the EndNote website or you can link to them from the Style Manager - Get More on the Web.
Styles Folder Location - the folder containing the styles that ship with EN is found in Program Files - EndNote - Styles. When you download a new style you have the otion to Save (this will save it into the Style folder in the EN program) OR Open - Save as (this will save it in a folder in Documents - EndNote - Styles). Now you can select this style from within your EN library.
N.B. You will need to save the new style on every computer where your EN program is installed. When you update to a later version of EN the Styles folder in the EN program will be overwritten so you will need to save any styles you have downloaded or customised and add these to the Styles folder in the new version of EN.