You should spend at least several hours on research every day. Visit the most popular websites and databases that can help you find proper material for your audience. Moreover, you should always look for new tools and services that can improve the quality of your content. Finally, you ought to establish a citing habit. Never steal content but cite it attentively. You will be rewarded for this noble gesture.
When it comes to words - less really is more. Don't use complicated jargon unless your blog's audience understands the lingo. Readers know when you have used the same words and are saying the same thing again. Remember the reader is smart - don't underestimate their ability to understand your words. Adjectives and adverbs can confuse and distract readers. Keep overused words such as "definitely," certainly," "really," etc. out of your article.