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The verbs of motion are always weird. You can say я ходил в магазин to mean you went to the store once and came back. And I'm not too sure myself if you can really say "завтра, я иду на работу"....

I think we'd have to go to native speakers for that one. I am of the opinion that you can't.

In this kind of situation I usually dodge the question and say something like this:

Я произношу речь на совещании.

However, I think буду говорить would probably be OK.

There are two:

Ya skazhu - perfective
Ya budu govorit' - imperfective

The first means that you will do something and be done with it, the second means that there will be some kind of ongoing...