To make a good poem you need to have a good imagination and have good ideas before writing one.
If you aren't in the mood to write a poem, but have to write ideas on scrap paper and put them all together so that when you write the entire poem you have a good idea and you have something to go by.
Rhyming is not neccisary for a poem, people do make rhyming poems but it really isn't needed for a good poem but if you can rhyme and you have a good sense of words that do rhyme then you can make one.
Writing a good poem takes quite a while and you may think you have done good, always read over a poem because you may find faults and you may have a better idea.
Rhyming and Non-Rhyming
If you want to make a good Rhyming poem then you need a good imagination like said at the other card.If you cant write a rhyming poem you don't have to, you can always write a good non-rhyming poem.
Writing non-rhyming poems can be as difficult as writing a rhyming poem. You just have to have a really good idea, and write ideas on paper before writing.