The order of the steps decides whether the application runs smoothly or stalls. Here is the whole route, from registration to submission at VFS in Bangkok.
A visitor visa (Schengen visa, type C) allows a stay of up to 90 days within 180 days. You apply BEFORE the trip, and the applicant is the person in Thailand — not the host in Norway.
The case officer needs to answer two questions: can you afford the trip, and will you go home again? Everything you submit should point at one of them.
This is the most important bundle, and the one most often missing. Employment contract and payslips. A letter from your employer confirming you have a job to return to. If you own property or land, bring the title deed. If you have children in school in Thailand, bring the confirmation.
An application without ties to the home country is the most common reason for refusal. Having enough money does not help if nothing suggests you will go home.
Expect several weeks from submission to decision, longer in high season. Apply well ahead, and never buy a ticket you cannot cancel before the visa is granted.