There are many network marketers that are currently failing and struggling because they don't have a mentor. There are also a small number of marketers that are successful online and even in your own community believe it or now.
As far as finding a mentor online. I would search around for marketers that are active. Read their profile and see if you connect with them some how and try and get in contact with them. That's the key, make it your goal to get into contact with a marketer who is being successful. If you can go as far as having a telephone conversation that would be great.
When you have found the right person you will know and they will also be willing to help you. If you are looking you will find exactly what you are looking for.