I need help to find the theme for each poem and highlight all figurative language and explain them. I am very bad at doing this with poetry. The...

As the guidelines of this website allow for one question a day, I can help you with one of those poems; for the others, I suggest submitting them separately.

The main theme of "The Best is Yet to Be" is love, and how love is the most important thing in a marriage, and how it will sustain you no matter what happens.  It has an A/B rhyme pattern, which means that in each stanza of 4 lines, every other line rhymes.  As far as figurative language goes, it is a pretty straight-forward poem without too many techniques.  There is a metaphor, where you compare two things, and that is "but love is the real treasure."  The author is comparing love to a treasure there, which is a metaphor.  Personification, where you give inanimate ideas human-like traits also exists when she describes when "life hands you challenges".  Life does not have hands, so cannot hand you a challenge, so that is personification.  We see it again when she states that "love will hold you steady."  That personification indicates that love has arms to hold one up.

I hope that those thoughts help, at least with this poem; good luck!