Do I need paid version for my purpose (Mailing between users& special registr.)

Hello,
I´m totally new with Joomla and CB.
This is what I want to have:
- A mailbox function on profiles so user can communicate (with the option of adding as friend),
- A registration field with: to chose --> a or b
if a, than chose c, d, or f
and if b, than chose g, h, or i
- A registration field for postal code, which accepts only 5 figures and not letters/ other number of figures.

Is that doable with free version or do I need pro version? Or which plugins to I need for these?
Thanks a lot in advance!!

- A mailbox function on profiles so user can communicate (with the option of adding as friend),

No, the email form is built into CB. Private Messages is provided by UddeIM and also free. Connections for adding friends is also built into CB.

- A registration field with: to chose --> a or b
if a, than chose c, d, or f
and if b, than chose g, h, or i

Yes, you need CB Conditional.

- A registration field for postal code, which accepts only 5 figures and not letters/ other number of figures.

That's just an integer field and is built into CB.

Hello,
thanks a lot