Yes, but it is better to apply to the consulate of the country where you will spend the most time.

All 27 countries of the Schengen area, including Italy, Spain, Germany, France and others.

No, you need a separate work visa to work.

From 10 to 30 days.

Yes, but in this case, the visa validity period is likely to be minimal.

Passport, booking of accommodation and air tickets, proof of income.

From 6 months to 5 years, depending on the applicant's visa history.

A minimum of €200 per day of travel, but the amount may vary depending on the country.