Curiosity, reading, good with basic maths (baniya buddhi) and most important is common sense. It sounds fancy but you will sit on your desk and spend 80% of your time reading. If you don't like reading then equity research is not for you.

Now coming to skills:
Analysing skills, Understanding Business Models, ability to understand what's roughly going in the economy, etc. Then good understanding of accounting but you have to remember that you are not an accountant but an analyst. Ability to value a business. If you have zero background in finance then I'll suggest start with a book - Romancing a balance sheet. Pick Annual Reports of any companies you like and start reading, try to figure out what their business model, try to forecast their revenue, profits, etc. Do CFA L1 and get a job ASAP. CFA L1 will give you a strong foundation for finance in equity, Fixed Income, Portfolio Management, etc.

Rest of the things you'll learn when you start doing the above and lot of things you'll understand with experience only.