Rebuild dataguard configuration when standby is broken

I have an Oracle Data Guard configuration with two servers: - oradb (physical) - oradbstb (standby) Both are running with Oracle 11g R2. A few days ago I had problems with the standby (the server was turned off and the primary files were not received ... which were subsequently deleted). I would like to know how to reconfigure the standby server from scratch. What would be the steps that I must carry out? On the primary database I make a full backup with rman every Saturday and the rest of the days I make a backup of archives also with rman. How should I go about restoring my standby database again? What steps should I follow?