Since you’re just a one-man operation, you can probably fit all the aspects of your business in a single team. One of the main reasons a single business might split their operations among several teams is due to permissions concerns. Luckily, as a one-man operation, you shouldn’t have to worry too much about other, unauthorized employees having access to confidential data.
Whether or not to split up the facets of your business into different bases, well—that’s ultimately up to you, although I personally would recommend trying to fit everything into a single base, at least at first.
Based on what we’ve seen, some people like to have different facets in different bases because it allows them to keep certain things which don’t have a whole lot to do with each other separate. The disadvantage of this, however, is that you can’t use the powerful linking features (and the associated field types like rollups, lookups, and count) across different bases. You may also have to end up repeating data if you split it over multiple bases, which can cause problems.
The Product Catalog template has a pretty good demonstration of how you can fit clients, suppliers, products, and orders into a single base spread out over multiple tables (this support article also has an explanation of how/why the tables are arranged the way that they are). The nonprofit ScholarMatch also runs their entire nonprofit off a single base—you can read this case study to find out how.
If you’re not sure, I would generally recommend starting with a smaller number of bases (perhaps just one, even), then, if you need to, you can split existing bases into multiple bases. This is a lot easier than consolidating many bases into a single base later, in my opinion!