The last CU update version for AX 2012 R2 was CU1 and the latest version is CU6. Wondering if you have missed a lots of updates in between have no concern. Microsoft is consolidating all versions of the AX 2012, FP & R2, so the next updates would be in a single sequential series rather than individual updates for each version. So it is perfectly ok to update your new AX 2012 R2 instance to CU6 after the CU1.
The version of the application will be set to 6.2.1000.1437, which means
6 - Dynamics AX Major Version
The direct partnersource link for the downloading the update is at https://mbs2.microsoft.com/Knowledgebase/KBDisplay.aspx?scid=kb%3ben-us%3b2850972
The version of the application will be set to 6.2.1000.1437, which means
6 - Dynamics AX Major Version