Hi,
first of all you have to define yourself. Think about who you want to be and what do you want to write about in the long run.
You should be as much specific as you can. Try to imagine to yourself your perfect reader. Who is he, whats`s his age, job, interests.
In what way he spends his free time etc.
Then think about who you don`t wanna be and what type of readers you are not interested in.
When you do that, write down all the ideas that come to your head regarding your blog title. Take your time. Not all of them will be fantastic.
Show them to your friends or people from your target group and ask for their opinion. Then choose the one with which you feel the most comfortable.
Quality content is a subject for a lot longer discussion.
If I may give you a piece of advice, I`ll say: just start doing it.
If you know your field, analize statistics, draw conlusions, optimize your content and you are persistent - you will be succesfull.