Once you find an online school which is accredited, you need to evaluate the program before enrolling in the same. Firstly you should study as to how the course is presented See the methodology used by the lecturer for giving a lecture. Understand if there is any interaction or the lecturer just posts the lecture online as text. It is easy to do an online course if it involves interaction in innovative ways. You need to go for a school which provides interactive learning. The next thing to watch is how the students interact with each other. You should opt for a school which has teleconferencing, video or instant messaging services etc.  Also look in detail, whether the instructor is qualified or not. Look for a school which has both development and support staff. Understand the school reputation too. Also check how the students are evaluated. The school should do full verification before awarding the degree. A good library and an online reference is must for a good school. Howstuffworks.com Reports:  

Make sure the school has a good system for ensuring that reference materials and texts are accessible from anywhere. If a student is taking a course in another state (or another country), the online program shouldn’t limit that student’s ability to do assignments because of lack of electronic reference materials. Online references are extremely important and should be up-to-date and accessible at any time. 

Read More: How Online Degrees Work