[alias_neo]

You've got a few answers from other people now. From my perspective, I'd say that the landscape has changed a bit since I started, at the time, the budget entrypoint was an Ender 3 v2 from Creality. Nowadays, they have better models, and there are plenty of other options out there.

I'd still personally recommend something like the (new) Ender 3, or similar, not because it's a great printer, but because the community around it is huge; you'll be able to get lots of help, and there are plenty of mods. Have a poke around Reddit etc and see what the most popular model is these days.

After a couple of years I heavily modified the E3v2, to the point nothing but the frame remains, and then I build a Voron v2.4 (350mm).

Once I had a printer, I started learning to design/model things, learn how modeling for 3D printing is different to other forms of manufacturing, and then just make things you want/need.

3D printing is still a hobby for me, that's the way I'd like it to stay so I've got no advice on making things for sale etc.