I would first ask yourself why you want to use monometer. In a momometer poem each line can have only one to two words, depending on the number of syllables. If you have only one word in the line, then the second syllable must have the stress. What would be the advantage of writing a poem in this style? One thing to keep in mind is that with such brevity of line, the idea of your poem should clear and direct.
The above would work as example of the type of poem you are trying to write. Play around with a mix of single and double word lines to create interest and vary the look of the poem.
You have to be very rythmical, use monosyllables with ver distinct sounds, think musically. It's always been helpful to me to just grab a poem and divide it into parts and see what happens, for example:
One equal/ temper of/ heroic hearts/
made weak/ by time/ and fate/ but strong/ in will/
to strive/ to seek/ to find/ and not/ to yield/
see? If you want to find words I recommend you to read the poems of writers such as Ezra pound, Kerouac, Allen Ginsberg, Gary Snyder, Gregory Corso and Charles Bukowski.
I also recommend to read haikus in english, they will really help you to simplify your ideas into fewer words: Jack Kerouacs haiku are pretty good.