I hate to answer a question with another question but.... what services will you be providing? The answer to that question will help you answer the other
Post back with more info and I'm sure we can all pitch in with some thoughts and suggestions!
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Some of the basic software you most likely will need is Microsoft Office Suite - word, excel, PowerPoint. This software is generally the most popular software used, but it will depend on what services you plan on providing. I'm sure you will get more responses when we know the services you plan on offering.