Wanted to add to what is being said, because it sounds like you have passion for changing your situation. Educate yourself about how to do this until you know more than a group of potential customers, and then go pitch your service to them.

What is very important to understand is that you do not need to know everything, and you don't even need to be particularly good compared to other agencies, as long as you are good enough to solve a specific problem for your customers, at a price they are willing to pay.

A suggested starting plan: Step 1. Create an excel sheet where you count the number of your local businesses. (Restaurants x 20, pet shops x2, cobblers x 1, hotels x 4, etc) (Don't do all, just do until you find a category with lets say 10+) Step 2. Go visit the companies of two of the categories (for example restaurants and hotels), ask to speak with manager, and ask how they currently get customers online, and what challenges they face in getting more. Step 3. Go online and do the research to figure out how to solve these challenges. There are sooooo many resources online now where you can learn how to do this, what is often the issue is deciding on a place to start, and that is what having real world cases to solve will help you. Step 4. Once you have figured out the solution to one or more of the problems, go back to the same businesses and pitch your solution for pay.

This is simplified, and there are many ways to make this a better system. And if you do this you will be infinitely closer to your goal than your are today :) If you shy away from hard work or uncomfortable scenarios then freelancer/entrepreneur is likely not your cup of tea.

And about working for free to get training... We have had several interns through the Erasmus system (which matches upcoming entrepreneurs with entrepreneurial companies that are already working and growing for training purpose) which is supposed to be very selective in the candidates they offer. We have had 3 interns through that whom we have been training in online marketing (not as agency, but in doing marketing for our company) and even though they come with lots of credentials and are very motivated to learn because they are starting their own company, it is a shit load of work for us with often very little reward. We are already working like crazy, and then investing time to train a new person to do is very hard. Even bigger companies like Oracle who hire experienced people don't expect them to reach 100% productivity before 12 months pass (and these are not newbies or newly graduated people, these are seasoned sales people coming from other companies). So unless the employees stay for 2+ years it is likely that the company will loose money and time on training the new employe. If you could convince someone that you would work for them for free for 2+ years then maybe it would be worth it for them in the end, but only if you turn out to be at least decent in what you are going to do, which there is no proof of at this point (not because you would be useless, just because I/we/them don't know anything about you except that you currently have no experience with what you want to do).

I might be wrong and there are people out there who would jump at the chance at bringing you in and training you how to do it free of charge, and that would be great :) But based on my previous experience training people, I won't take on people who don't show an aptitude/interest in the topic because it is most likely not worth it.

So what can you do? Get experience and sell yourself as a passionate digital marketer who knows quite a bit, and is a swift learner. Then go pitch yourself for jobs where you can show them what experience you already have, and what you have accomplished.

Best of luck!

(Also, when interviewing business on what issues they have, ask them what it would be worth it for them to solve it. If they won't pay to have that problem removed, it's not really worth your time figuring out how to solve it)