it looks like a "product brief" which gives no hint as to how you're intended to use this product.

It does indicate that you're limited to data rates in the range of 200-3000 bps, so, for a simple checkout, I'd use a standard baud rate that fits that range, say, 1200 baud.

You've got to provide an adequate antenna, at both ends, and you must deal with the turn-on delay. Their product brief tells you nothing about what happens during the first 30-40 ms after turn-on. It also tells you nothing about the nature of the input the TX module expects, nor does it say whta the RX module produces.

The RX module is PLL-based, hence will probably need a sync string of some sort in order to acquire the incoming signal.

You can't work with the little data that their web-published sheets provide. You need more information than that. Have you got any additional information?

RE