I didn't think I was ready for it financially. That was a correct thought. It seemed my only option.
I will do consulting or design. It depends on the customer and what they want or need. No construction.
Used my own capital because no bank would do a business loan. It's been expensive. One fella' repeatedly said to use other people's money never your own. I don't know how that is accomplished and when I asked him, he didn't either. I had to laugh...and shake my head.

People say a lot of stuff.
It will be the most rewarding enterprise you undertake as an engineer in all ways. You'll be exposed to people, projects, and opportunities you never will as a direct employee. Just ensure you and your family are ready for it and want it.
It is a lot of work. You will not be able to do it all. Consequently, position yourself to hire others or contract them. I contracted.
Look for clients that have money to spend and if they don't, walk away. What they want and what they are willing to pay for will be oceans from each other. I know some that bluntly ask if the potential client has the money to spend and they ask it right away to not waste anyone's time, particularly their own. If they don't have money, the meeting is twenty minutes and they're gone. They're very polite about it but very blunt and to the point.
If the client is going to use end of year money to finance the potential project, walk away, unless it is a very small project and end of year money will cover it. If it is a large project, it needs to be run and financed like a large project. Don't kid yourself about that or let anyone else do it to you.
Learn good project management skills, if you haven't already. They are needed and work.
Document everything diligently.
Have a good contract.
Call around to check potential clients out. That happens often in my world. People will call suppliers to find out what kind of people they'll be working for. Easy to work with, supportive, serious, pay bills on time, has money to spend, are they sue happy, honest, fair, etc.? Everyone has a reputation at stake and you do not want to tangle with a company that will give you grief. If a company gives you grief and you are doing your job, they are not a good company. Good companies will not hesitate to pay you fairly for work performed.
Having employees and/or partners will be a lot of work. People have problems you cannot imagine. Those problems will present you with some very tough decisions to make. Don't kid yourself about that either.
Grow your company so that it is independent of you and whatever life may throw at you. My business has come to a grindingly slow pace due to an event beyond my control. If I have an opportunity to continue, I will welcome it.
Whatever you do I wish you all the best.
Pamela K. Quillin, P.E.
Quillin Engineering, LLC