You will need to find the site, get your permits, then start getting customers. Remember that acquiring things like the permits are the easiest part--it's the attracting of customers that will take the most work.
As for doing it more as an investment, take a look through brokers and websites to see if there are any already running in your area for sale. You may be able to buy it and hire a team of people to run it for you from day 1.
Brad Sugars is the founder and chairman of ActionCOACH. As an entrepreneur, author and business coach, he has owned and operated more than two dozen companies including his main company, ActionCOACH, which has more than 1,000 offices in 34 countries.