Let me spell it out for you:

- Pick an address in your wallet

- Send said address to all the people you want to receive money from

- Profit

Don't worry about the privacy aspect of it. If you have to receive money from multiple people you reuse a single address. This is how everyone does it. The anal retentive among us can do multiple addresses but you don't have to be like that.

edit: And, for future reference, don't post in this section of the forums. This is for technical people. Yo should have posted in beginners and help and you would have gotten answers more appropriate for a newbie.