You can go for Umrah without wearing Ihram from Dubai. If there is no Miqat before Jeddah then you can wear Ihram on arriving Jeddah otherwise you should wear Ihram of Umrah before Miqat. After wearing Ihram you should avoid things prohibited in the state of Ihram.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband