Hellow Friend,
Now you can apply for dataflow directly to the SCH in to the conter no:14.All the requirements and application form for Data Flow is in SCH website.From there u can take the print , make all the documents ready and pay 600QR as cash inthe SCH.If some employer from the Qatar is ready to give NOC for Evaluation means u can apply for Evaluation through online.When the Data Flow and Evaluation completed then only you need the police clearence and medical report, Prometric exam passed certificate for licence. SCH web address : www.sch.gov.qa