Try to NOT borrow any money.
Work out of your home / garage for free rent first. Less risky ?
Work in the field / profession as an employee first. This may help you decide if you want this type of work before investing any personal money.
Get good insurance, set up legal protection so as to not lose your home if things do not go well ( Think LLC or such ).
Talk to local retired business owners at Rotary, Elk, Eagles, your church...for local issues.
Do a detailed, written business plan and budget.
Best advice yet.
I would suggest working in the field for at least two years before starting your own business.