Small Business Marketing Strategy

Small Business Accounting Software with Payslip?
I ran a small business company, in the Gulf region, offering maintenance services to properties with about 50 employees. Can anybody recommend a real good and simple Accounting Software with integrated Payslip , which can take good care of both cash flow, sales, invoicing and bookkeeping?

We are a new accounting / bookkeeping / taxes / payroll / website development / presentation / travel arrangement/ etc… company and would like to know the best way to effectively market to our target customers – small business owners. Any suggestions?