Kindly refer to the following links:

Short Description of Umrah

Is it Mandatory to Perform Ghusl and Pray 2 rakahs before making Ihram for Umrah?

How to enter Ihram?

Dua and Athkaar during Umrah

Uncovering right shoulder (umrah)

Made Umrah but got sick, umrah unaccepted (sign)?

Dua in Safa Marwa (saee)

The proper way of making dua between safa and marwa

Repeating Umrah and the Gap between Umrahs

Wearing Ihram to fool the authorities to do Tawaf?