U dont need any thing from your employer , if you are working on an executive position eg. engineer or doctor or on any executive post. Only u need to go immigration office near airport, they will provide you one page form, very simple to fill. Police will examine the forms and then they will ask u pay 100 QR per person with ATM card or Credit card and will give u the reciept. afterword u can download visa within one hour.

documents u need to take with u...copy of the passports of ur family memebers. Original and copy of ur RP and passport , thats it.