Hi Thomas. A business registration, without a previous supporting market study, normally is only a symbolic action. Do you know in detail your market, customer profile, competition, real demand for your product or service, right time for introduction, resources required, etc.? And that early market analysis will be an important input to your business plan, which is a key instrument for the life/development of your business. A good plan will assist you to get the necessary funds from banks and investors, showing them you are serious and capable about it. I wish you success.
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I agree with Miguel, you need to start with a business plan. There are some simple templates you can find online that identify the major sections you should include.
After that, you should seek out free or inexpensive ways (you mentioned no money) to begin marketing your business to get your name out there and try to earn clients. Try to use social media platforms to your advantage, making short videos about your offerings and possibly providing some free consultations and advice. Good luck!