Lots to unpack here; Insurance quotes I have seen for myself (33 years old, healthy man, single) was high 300's for a decent policy. Catastrophic only coverage was 40/month. Taxes... Talk to a cpa in your state. Security, keep your resume updated, keep your sense of employment work ethic and skills or associated licenses, certifications in case you want or need to go back into the job market. Emergency life situations I would keep a 15-20k credit card empty or LOC, with a payment you have already factored in to your monthly budget.
Factors on reserves; What's your monthly cashflow / how much do you need to live? For my own sake I wouldn't be comfortable walking away without at least 20-30k in personal liquidity in a 4-5% credit union acct. If you have a $1,500 or more spread between cash flow and living expenses, I would consider saving the rest to add to a cushion.
LLC s selection I believe makes it a pass through entity meaning once tax return however I would run this by an attorney or your cpa as I am neither.
Full disclosure I am in the Midwest so if you're market is drastically more or less cost of living this may vary for you numbers wise.