Questions and research from customers/clients are great places to start. Also:

Industry trends and predictions

Hot topics/current news in industry/marketplace

Tips and advice on how to do something better/more efficient/etc

There are a few good formats you can use and they include:

How-to

Top 10 (or whatever)

Q&A or FAQ

Did You Know

Current News & Event(s)

Promotions/Announcements

Mini case studies

Whatever format and topic you choose, remember to include headings, at least one image, and use short paragraphs. Aim for around 400-700 words for a blog, and your title should be catchy and contain at least one relevant keyword. Always spell check; there's nothing worse than putting material out there to promote your expertise and having spelling or grammatical errors in your writing.

Message me with any questions - happy to help answer additional questions!

-Julia