If you want to visit only one of the Schengen countries, then you will have to apply for a visa for that particular country only. But in case you plan to visit more than one of the Schengen countries, then apply for a Schengen visa and state the country which will be your primary destination. 

For a visa, you may need the following documents:

1. Invitation from the host with one or more supporting documents for accommodation.
2. Visa Application form duly filled and signed by all applicants traveling. 
3. 2 recent passport size photographs taken within the last 3 months. Each photo should be of 35X45 mm with matte background. It should display 70-80% of your face.
4. Passport which is not older than 10 years and has a minimum validity of 3 months. 
5. Flight tickets for each country both to and from.
6. Complete travel itinerary. 
7. Proof of accommodation for hotels/Airbnb’s where you plan to stay. 
8. Travel or Health Insurance that gives you medical coverage of up to €30,000
9. Proof of financial means like bank statement for the last 3 months. If you have a sponsor, then the financially sponsoring letter.

1. For employed, then you should submit an employment contract, leave permission, Income Tax Return.
2. For Self-Employed, a copy of your business license, the company’s bank statement for the last 6 months, Income Tax Return.
3. For Students, proof of enrolment and NOC from university or college.
4. For minors, a letter signed by the guardians will suffice.