HElp with talking with guys ( gay )?

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well i always talk lol i talk with friend but it because we have stuff to talk about haa... and well i recently met this guy and we been txting and all we know alot about each other and he called me once and well we talked a good 10 mins before i had school... so well i was nervous the whole time and no friend was around to help me... i sortta dont know what to talk about with him since i dont know what he will laugh about and what he will get mad about you know... so when i was talking with him i just like froze up i couldnt think straight... or anything... ppl say just goo with the flow but its hard to go with the flow if u dont know what to talk about, cause u talked about alot so far, and all just please help me/