This is an excellent product that will teach you what it takes to have fun and interesting conversations.
Don't forget that the non-verbal communication plays maybe even a bigger role in choosing next potential date than the verbal one.
If your main challenge is knowing what to say to start a conversation, or overcoming social anxiety or approach anxiety, a great product to check out is Say Hello by Christian Hudson.
It focuses more on starting the conversation and keeping it fun and attractive, plus building up your confidence to make approaching women simple and fun.
All you are really trying to figure out on the speed date is whether the two of you have something in common and if you would be able to carry out a conversation that lasts longer than four minutes.
Common rule is also to avoid talks about controversial topics like politics or religion.