3 ways I do it:
If I know the topics already:
1. just write away and do the restructuring later.
2. make an outline and write content per title.
3. look at similar topics online and copy their structure and topics. I dont plagiarize I just get inspiration from them.
If I dont know about the topic (for freelance work I do, happens a lot) It takes me around 30 mins to an hour of reading before I can start writing.