Visit Project Gutenberg to download your (free) copy of How to Speak and Write Correctly -- it's helpful to know what the rules are before you break them. :-)
The book is full of great info (who knew?) like:
(3) The use of the verbs _shall_ and _will_ is a rock upon which even
the best speakers come to wreck. They are interchanged recklessly.
Their significance changes according as they are used with the first,
second or third person. With the first person _shall_ is used in direct
statement to express a simple future action; as, "I shall go to the
city to-morrow." With the second and third persons _shall_ is used to
express a determination; as, "You _shall_ go to the city to-morrow,"
"He _shall_ go to the city to-morrow."
With the first person _will_ is used in direct statement to express
determination, as, "I will go to the city to-morrow." With the second and
third persons _will_ is used to express simple future action; as, "You
_will_ go to the city to-morrow," "He _will_ go to the city to-morrow."
A very old rule regarding the uses of _shall_ and _will_ is thus
expressed in rhyme:
In the first person simply _shall_ foretells,
In _will_ a threat or else a promise dwells.
_Shall_ in the second and third does threat,
_Will_ simply then foretells the future feat.