You need to do the following;
transfer the FSMO roles
enable the global catalog
transfer dhcp
enable dns server
Understand that Microsoft recommends TWO DCs for Active Dirctory failover. Might want to consider keeping two DCs
Do understand that the tack of bringing up another DC has NOTHING to do with you not being able to bring up the admin tools. If AD ic corrupt you will just replicate the issue to the new AD peer server.
Consider your rights and account status instead.
ref :adc to dc
see this ;
ADC to DC?