Most of the rest depends on the size/stage of the startup. Equity grants are determined by a combination of your role, their stage, and your negotiating ability. Salaries tend to be lower for earlier stage companies since cash is limited and valuable - discuss a plan ahead of time for a bump upon next milestone/fundraise. Recognize that at a startup, you're anchoring yourself at the salary/equity to agree to when you join - so be comfortable with the agreed upon terms. Ask friends, look on Angel List, etc. to make sure you're getting a fair deal.
Good luck! Startups are exhilarating and, more often than not, they help you level-up your skills faster than most other opportunities.
This is going to be a tough if one does not understand the space or assess the market.
When trying to evaluate the above items, make sure you understand how much your compensation actually is. Are you getting stock or options? How much is the strike price vs current shares selling price? How many outstanding share? How many outstanding options? Do they have any dilution protection? Are they the same series/rights as investors? Are additional options currently authorized but not issued? Is there ability to sell shares currently? If not then when?
FYI working for an established company does not mean your job is any more secure.
FWIW, I started a company that is 17 years old now so I think I have, at least, a little knowledge behind my opinion.
Lastly, this is random internet advice so ymmv.
If they balk at telling you their numbers, tell them you'll take a graph with the y-axis cropped off. The shape of the graph matters more than the numbers.