I think it's great that you want to contribute.
You may want to take a look at becoming an instructor for a course like Dave Ramsey's Financial Peace University. These are commonly offered through churches and other community venues for a fee.
This may be a good fit if you want to focus on basic financial literacy, setting up and sticking to a budget, and getting their financial "house" in order. It may not be a good fit if you don't want to teach an existing curriculum, or if you find the tenets of the course too unpalatable. A significant number of the people in Dave's audience are close to or in the middle of a financial meltdown, and so his advice includes controversial ideas such as avoiding credit altogether, often because that's how they got into their current mess.
If you want to run your own show, I know of several people who have built their own practice that is run along the lines of a counselor charging hourly rates, and they work with couples who are having money problems. Building a reputation and a network of referring counselors and professionals is key here, and definitely seems like it would require a full-time commitment.
I would avoid "credit counseling" and the like. Most of these organizations are focused on restructuring credit card debt, not spending signficant time on behavioral change.
You don't need a series 7, 63, 65 etc. or even a CFA. I've previously acquired a number of these and can confirm that they are investment credentials that are intended to help you get a job and/or get more business as a broker or conventional financial planner, i.e. salesperson of securities. The licensure process is necessary to protect consumers from advice that serves the investment sales force but is bad for the consumer, and because you must be licensed to provide investment advice. There is a class of fee-only financial planners, but they primarily deal with complex issues that allow them to make money, and often give away basic personal finance advice for free in the form of articles, podcasts, etc.
For part-time or free work, in my area there are also several charity organizations that help people do their taxes and provide basic budgeting and personal finance instruction, but this is very localized and may vary quite a bit depending on where you live. However, if there are none near you, you can always start one!
If you have an interest in writing, there are also people who work as journalists and write columns, books, or newsletters, and it is much easier now to publish and build a network online, either on your own, through a blog or contributing to a website.
Speaker at Community events
There are also many opportunities to speak to a specific community such as a church or social organization. For example, where I live there are local organizations for Spanish speaking, Polish speaking, elderly, young professional, young mother and retiree groups for example, all of who might be interested in your advice on issues that specifically address their needs.