To earn money in Hubpages, there are several things to remember.
1- Write good rich, original content with at least 500 words. Check spelling and grammar and add a couple of links that would be helpful to the reader.
2-Visit other hubs and be sure to rate and comment.
3.The quality of the hub is more important than the quantity.
It takes time to earn money. Be patient, write for the love of writing, support others to help you build a following and one day the money will come.