Hi LeAnna - Welcome to Preservation Talk!
First and foremost - You've chosen a very risky industry to be starting a new business in. The players in this industry are well known for taking advantage of and exploiting noobs who don't know any better. One of the smartest things you can do is what you're doing here - Asking questions & learning all you can rather than thinking you know it all already.
I have been in property preservation for 16 years. I have a lot of experience, but I'm definitely still learning. Here's some quick answers, hope they can help you out:
1. Insurance needs are best discussed with your insurance agent. I carry a general liability policy with riders that cover all the classes of work I might perform at any given property, and I make sure my minimums meet or exceed my clients expectations. Some clients use to require Errors & Omissions insurance and I paid for that policy for multiple years. My suggestion to you is simply steer clear of any companies that require E&O, working for them is not worth the other hassles that come with a company like that.
2. There are zero educational or certification programs that are going to prepare you for this industry. Your best bet is to go to work for someone in the business and learn from them, or find a mentor that can advise you on a day to day basis.
3. There are no regional or national companies that I can recommend to you in good conscience. I have completed work for a vast majority of them over the years and have had some good, some not so good, and some terribly bad experiences. I will say that most of my good experiences were a result of getting to know and solely dealing with only 1 or 2 people within a company that have the ability to negotiate and power to then sign my contracts based on those negotiations.