I need Help on how to convey my thoughts through words orally!?

Hello magnificent world of yahootopia, I desperately need advice,help,tips,etcetera in ways that I can vocally speak my mind precisely without any difficulties. I'm not speaking about eloquence here, but whenever I want to answer back a question with thoughts in my head, it just doesn't come out the way I want it to. I don't lack the vocabulary, I just lack formulating proper sentences vocally!! Maybe.