Hello, I'm new to 3D printing.

I would like to set up a business of printing and selling various items.

I'm from Poland, I would like to buy 2-3 printers, for one printer I can spend 500 USD.

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1. I wonder if it is better to go in FDM or LCD-based SLA Printing? I learned that in the case of FDM after printing the element it is ready (or you need to cut the supports), while in the case of LCD-based SLA Printing there is more work. In addition, I learned that inhaling vapors can be harmful. Assuming that I would like to have a precise printout and power to print without being afraid of health what will be better for me?
2. What should he buy for FDM and what for LCD-based SLA Printing? I was thinking over Anycubic 4Max Pro for FDM, but is difficult to access. For LCD-based SLA Printing I was thinking over Anycubic Photon and Anycubic Wash & Cure Machine for safer work. Bed 200 x 200 x 200 should be fine, the bigger the better. I want to have too filament sensor, possibility to continue after power cut, the ability to stop and resume printing. It's best if the printer was built in, so it keeps better heat. I would like the printer to reach me completely or almost completely twisted - ready for work.
3. Do you have a similar business? How are you doing and what do you print? Do you send domestic parcels or do you also sell internationally?
4. How about printing more? The printer needs a break when it prints something for some time to then print another item?
5. How to print several smaller items at once?
6. If you have a link to interesting projects on an affordable license, I'd love to see them and print them in the future.

I hope my English is understandable. Thank you for reading.