Setting up a salon is actually quite an expensive job, the property rental
can be $15,000+ per year, plus you need to kit it out with chairs, equipment
and staff. If you don't have the location and demand you can leave yourself
walking on thin ice. You need to test the demand for the area, perhaps
starting as a mobile hairdresser, gaining some of you own capital, then
investors and lenders will take you more seriously.

The answer may vary depending upon what is meant by not so good credit. If
the credit score is over 600 then for business that have been in business a
half a year, they may qualify for some of the partners of sba on this site.
If it is a start from scratch loan, then as mentioned by the other poster,
the best bet may be getting the owner to self finance it to you. You will
need some money down for them to agree to that, almost certainly. As
mentioned if family can assist you that would help

Loans are difficult to get today even with good credit. Your best bet is
family and friends. If you are planning to purchase an established salon,
perhaps the current owner will carry the loan.