These kinds of questions answered several times in Qatar living, please search,

Again if u are applying for visit visa for you blood relative or family, then u need to get the paper work completed alongwith the passport copies of the person(s) that u are applying and approach any of the immigration offices ( ex in gharrafa, abuhamour, wakra etc,.) and file your paper, if eveything is fine you will get visa within 3-4 days.