If you google "books recommended by Mark Cuban" youll find some great books in general, and one on cold calls. Im actually reading it for the 3rd time in 4 years (it's short).
Cold Calling Techniques (That Really Work!) https://www.amazon.com/dp/1440572178/ref=cm_sw_r_sms_c_api_vAbVybPMYTTYF
It stays away from theory, and instead focuses on how to structure a script and respond to some common responses.
For example, when I call Ill say something like "Hello, my name is Dan LastName with Process Donation, is this a good time to talk?"
Sometimes people say yes, and sometimes people say no. Ive actually had better success when people say no! But no matter what they say, I jump into:
"Well all I really want to do is setup an online presentation of our donor management platform. How does Tuesday at 2pm central sound?"
At the point they either say yes or no. He teaches what to say if they say no, but I havent had the balls to use it yet. Im still getting comfortable being a salesman myself.
Calling people up and trying to sell them something... even if it will help them... still feels unnatural. But it just takes practice like anything else.
"Cold Calling That Really Works" . Easy read to get you motivated. https://www.amazon.com/Cold-Calling-Techniques-That-Really/dp/1440572178/ref=sr_1_5?dchild=1&keywords=cold+calling&qid=1619470519&sr=8-5