Hi @jtsaidc
Section ID: This is id of the widget you use. You can use any word as id. But we recommend you to use relevant words. Like for services it can be services, our-services, service, etc.
Excerpt Length: It is the option to control description of services item. Suppose you gave 20 on this option, then 20 words will be visible on services list. If your description has more than 20 words … will be appended after 20th words and other text will be cutoff.
For icon you need to use class of font-awesome. For example: If you want to use icon of apple logo, you need to use fa-apple. You can find it here: http://fontawesome.io/cheatsheet/