Oracle 11gR2 - ASM tablespace creation

Hi,

Im trying to set up Oracle using ASM. Installed it like this:

Oracle  was installed using 11GR2 patterns.

Two users created:  grid for infrastructure and Oracle for the DB

-      Instance ASM: (Infrastructure).
ORACLE_SID=+ASM
ORACLE_BASE=/u01/app/grid
ORACLE_HOME=/u01/app/grid/product/11.2.0/grid

-      Instance DPDB:
ORACLE_SID=DPDB
ORACLE_BASE=/u01/app/oracle
ORACLE_HOME=/u01/app/oracle/product/11.2.0/db_1

-      Mount Points created in ASM:
Visible through the user GRID and the ASM tool.
NOTE: not usual UNIX filesystems
Eg.:
$ asmcmd
ASMCMD> lsdg
State    Type    Rebal  Sector  Block       AU  Total_MB  Free_MB  Req_mir_free_MB  Usable_file_MB  Offline_disks  Voting_files  Name
MOUNTED  EXTERN  N         512   4096  1048576     25557    25505                0           25505              0             N  ARCH/
MOUNTED  EXTERN  N         512   4096  1048576     66519    64931                0           64931              0             N  DATA/
MOUNTED  EXTERN  N         512   4096  1048576     10197    10145                0           10145              0             N  REDO/

So now the problem:

I will run a script that will create a bunch of tablespaces - among other things - for DPDB (script wasnt set for ASM use).

So I have to run these TS manually.

Basically a appl will have to access the tables inside these tablespaces using the DPDB.. but Im not sure how to create then for ASM...

I read this:
'You need to create your diskgroups in ASM, then create your tablespaces in the ASM diskgroup.

If you setup the instance with db_create_file_dest = ‘+<DISKGROUP>’ then you can simply do “create tablespace <TBLSPACE_NAME>;” '

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Would it be the right way to do it? How could I create these diskgroups in ASM? This variable is necessary?

Any suggestion?

Tks,
Joao