Every country and states have their business statutes . Make sure you comply with all these statutes in the country or state where your business is registered. Next will be to find out if your business of interest is really of interest to your target.
Note, in case you need to purchase an existing business, you have to keep in mind that the cost mostly depends on the popularity and the financial status of such business. Some of the things that influence the costs include- the size, number of outlets, financial status , and how long the company has been in existence.
In case you want to buy a newly established business, you must check the parent company’s history so as to evaluate its longevity in the particular sector of operation and how the owner(s) have managed the company so far.
Here is how to go about it -Read here http://naijaentrepreneur.com/2017/04/19/guidelines-for-investing-or-acquiring-a-company/