Pulse shape filter design

HI
I am designing a communication system in which pulse shaping will be required.
I am using square root raised cosine transmit filter available in simulink.
My question is about deciding the parameters for the pulse shaping filter.
I know it is used to reduce ISI but how many symbols a filter response shoiuld take?
what is the optimum roll off for a filter under consideration etc.
If you can guide about some nice literature on the topic,it will be of great help.
As a reference I have attached screen shot of the parameters.

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