Thanks for your question, Congratulations on getting the interview opportunity from Qatar Airways Group. I will give you two links to an answer where I wrote everything related to all interview processes from Qatar Airways.
Sonru App / WebEx / F2F Interview Done But No Response From Qatar Airways HR Department?
What Are The Application Status Meaning Qatar Airways Website?
If this is your first interview you will be on the Sonru App interview so you need to prepare yourself for that. Yes, you need to earn business attire like a Tie, Coat, White Shirt, etc. Just be professional and cut your hair. This is called pre-recorded interview process so no one will be there just a video interview. Once you are done with the interview it will be submitted to the company.
Please read the answer from the above links you will get everything.
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