As someone who loves making ramen at home, and judging entirely from a photo which speaks nothing of taste, it might be a little miso heavy. If you live in a western country, using chicken stock to dilute it should be perfectly fine.
6.5 to 7 minutes depending on the size of your eggs. For flavouring, it's a general stock of ginger, soy, mirin, sugar which I recommend looking up and trying various blends for what you like best
Wat