How can this help sole proprietor with no employees? I rent space in a salon to run my business, can this help me?

Yes. 60% must be payroll and your business rent can be a part of the remaining 40% when you apply for forgiveness. You are eligible for PPP at 2.5 X your taxible income as it appears on your 2019 Schedule C or K-1. However, you may want to compare that to collecting Unemployment Insurance.