I recently got my Schengen Visa from French embassy. Below r d docs reqrd-
1. Return air ticket- Just dummy ticket is enough which any travel agent can give u without any charge
2. Travel insurance covering the dates of your full journey. Coverage of min 30k euros. I took from Axa. Shud cost u 72 qar for 15 days for 1 person.
3. Six month bank statement with bank seal. Good to have at least 15k-16k QAR balance.
4. Letter to the respective embassy from your employer. This shud be in standard format n i belive d visa section of ur compny wud know abt d format.
5. 2 PP photos in standard format reqd for Schengen visa. Any photo studio shud b able to give dat. Shud cost u 25 qar for 8 photos.
6. Full hotel booking.
7. QID n PP copies
8. Take enough copies as if u make xerox in embassy den they will charge u 3 qar per copy.

i appied thru Capago mena. It is French embassy authorized company which collect d docs n gives back PP with visa stamp.

For Swiss embassy visa u can chk this link
https://www.eda.admin.ch/content/countries/qatar/en/home/visa/tourismus/...