Before you can start to look out for other peoples problems, you'll have to find a niche that you're passionate about and that you enjoy learning about:
If you don't enjoy the niche, you'll have a hard time writing and providing people with solutions.
When you start a blog, it should be related to one niche. That could be drumming, healthy food, exercise, video creation, or whatever.
Just make sure that you pick a niche that you're passionate about and enjoy learning about. Your passion will be reflected in your text and this is what you want.
Like I said, having a unique idea is great, but if no one is searching for it, you won't have an audience
So make sure that others write about similar topics and that there is a demand for your niche.
You can find out, by doing a quick search on google:
Drum tuning is a topic that most people have likely never heard of, but still, there are 44M search results and many articles. This indicates that there is a lot of demand, so probably a good topic to write an article about.
Remember, it doesn't matter that others already wrote about it. You give it a unique voice and also you create a brand new article, which is up to date.
Generally, you should stay away from niches that are just too broad. So instead of starting a blog all about "Music", you should probably consider a more specific topic like "Drumming", for example.
As soon as you have made a decision with your niche, you should get your domain and hosting and set up your blog