There are a variety of different ways in which you can promote your team. Here are two I could come up with:
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Holding an open house at your workshop is a great way to get attention to your team. Spread the word of this open house to teachers, students, and local businesses. If these people see how you operate as a team, and where you operate, parents and teachers could possibly jump on board and become a mentor. Inviting local businesses gives you a chance to gain some sponsorships.
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Setting up a display at local fair. If there are any fairs/festivals in your area, contact the person in charge. Setting up a booth at an event such as this can spread the word of your team. 3547 (VIRUS) does this at the Monroe County Fair in Monroe, MI.
I'm not much into the business aspect of my team, but starting a fundraiser may be a great way to start the flow of money.
Here is a toolkit from the FIRST website for fundraising. Another way is to visit local businesses, small or large, and talk to them about your team. If they are a large corporation, get contact information for the correct person to talk to about a sponsorship.
If you are wanting to teach others the knowledge needed to build a robot, again, a great place to go would be a teacher and/or a business that specializes in mechanical, electrical, programming, or drafting work. Have team meetings over the summer which is dedicated to teaching the team members.
Once the students have the knowledge of the basics, establish a system. My team is split up into subgroups, each specializing in an area of building a robot. These groups (Build, Electrical, Programming, CAD, Business, and there used to be a Animation team) all work on their parts.
I wish you luck in organizing your team! If you have any questions, you can PM me.