antenna matching network

Hi all,
I'm new in RF designs and need a lot of help.
I'm going to add a RF module to an existing application, maybe RF650 from RF-SOLUTIONS, and I would like to know what must I consider and how to calculate the matching network for a 50ohm antenna.
Thanks a million in advance.

If you don't have any RF experience why don't use a 50 ohms antenna? In this case you don't need any matching network between transceiver and antenna.

Thanks vfone,
I thought a matching network should be needed even using a 50ohm antenna.
I will try with a 50ohm antenna directly attached to the RF module.