Answer:
1- At first the poet did not receive the things he asked for from god, but the things he got ended up slowly turning into what he wanted. At first he received Worms, and Cacti which he didn't want because they didn't fit his interests and descriptions of the things he liked.
2- If I were the poet at first, I honestly wouldnt be disappointed because everything on earth in my opinion is beautiful and this poem is excellent and has so much pre meaning behind it than others!
3- I think the message of this poem is that not everything is always going to be as it seems, it takes time for things to become what you want!
4- Just tell them a experience you've had before about times you asked or prayed for something, and say if you got what you wanted, and how you felt afterwards. :)