As far as GST registration is concerned. First let us analyse the conditions if fulfilled one has to compulsory register under GST. Below are the few main conditions, which relates to your line of business.
- If supplies more than 20 lakhs in a financial year,
- Engaged in interstate supply
- E-commerce operator liable to collect tax at source
- Selling on online portals liable to collect tax at source
Your turnover is not more than 20 lakhs.
You are not selling products through E-commerce operators.
You are not E-commerce operator.
But if the site to which you are providing service (the site which pays) is registered in different state in India , then you are making interstate supply. In that case you are liable for registration.
So first view is that you are liable for registration and should get the registration done.
Also refer GST on bloggers and adsense income