Sounds like a vba assignment. None of these items are particularly difficult but all will require a bit of research to learn some vba.

You should treat the first two as separate macros (both of which can be done in as few as three lines of code). The last three can be done in a more complicated macro and has a couple of different ways to approach the problem.

Some specific google searches that would help you work out macro 1 is:
VBA ActiveDocument.Sentences
VBA Font.Bold Range
VBA "For Each"

We can help once you have made an attempt at creating some macros and you post them here. The point of this is for you to learn...

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Andrew Lockton
Chrysalis Design, Melbourne Australia