Be original, be yourself, don't have grammar or spelling mistakes, thoroughly cover the topic but make sure every sentence has a purpose, and write quality content.
These are some of the most important elements of writing online. If readers enjoy reading your content for whatever reason it may be, then your golden.
If readers aren't enjoying it, then put yourself in their shoes and figure out what's driving them away. Or ask for some advice from fellow hubbers.
I hope this provides you with some advice to get started. Send me a PM if you need more help/advice and I'll be glad to see what I can do :)