1. You'd better write what you are interested in, or you'll be in a mess later.
I personally recommend that in terms of culture, it will be easier to start with our current level.
2. Don't set too big a topic. If it is too big, it is not easy to write and it is easier to be denied.
Be sure to look for information at present and make sure there is enough information for your writing.
It is wrong to make it up by yourself, so we must be careful about this.
I hope I can help you. Good luck.