How would I write a poem with three lines of blank verse, 5 iambs each, second line with assonance, third line with alliteration? Please help!

First of all, if you do not have a subject for your poem,
you will need to brainstorm about what you will write.  Try to avoid the usual topics of
love or friendship; perhaps you could write about some aspect of a day such as dusk or
dawn or about a creature of nature as Emily Dickinson and D. H. Lawrence did.  Also
expressing your unique point of view about a feeling can provide ideas, as well.  Miss
Dickinson, for instance, wrote about hope being "a thing with feathers."  When you
decide upon a topic for your poem, then determine what the controlling metaphor will be.
That is, to what are you going to compare this idea or feeling?  The metaphor that you
use should be a fresh and unusual one.

One you decide
upon the subject matter of your poem, write lines that express the comparison of the
controlling metaphor.  For them to be iambic pentameter, there must be 5 feet (5 sets)
of an unstressed syllable followed by a stressed one.  The line's rhythm then
reads ta dum, ta dum, ta dum, ta dum, ta dum.  For examples of
iambic pentameter refer to Shakespeare's Romeo and Juliet which is
written almost entirely in iambic pentameter (or his sonnets).  Of course, assonance is
the repetition of vowel sounds and alliteration is the repetition of initial cosonant
sounds.  For instance, these two lines have alliteration of the
/s/:

I craved
strong sweets, but
those

Seemed strong when I was
young

And here is an example
of assonance in which the a sounds contribute to the poem's
musicality:

readability="7">

Cooked on the homeblack of a flat
stove.

Flipped to slap the birth
awake.

Wrapped by corn
hands. 

Take a walk and
think; you will be surprised what good ideas spring from a good walk.  Below is a site
that the poets e.e.cummings advice to young poets "APoet's
Advice".