I'm based in India and have a proprietorship. How can I show my experience? Am I eligible for express entry?
You should be able to produce certificates of incorporation, tax returns, bank statements, TDS certificates, (for proof of revenue generation) and reference letters from clients.
Since, you are a proprietorship firm, you won't have a certificate of incorporation or a partnership deed. In that case, a GST certificate in the name of your firm or a shop license will work.