URGENT!!! Spanish speakers only!!

I need to write a paragraph with these steps in Spanish with preterite tense.

I wrote the letter
I folded the paper
I put the letter in the envelope
I went to the post office
I bought a stamp
I put the stamp on the envelope
I gave the letter to the postman
He put the letter in the mailbox

Please answer in 20 minutes or less. Thanks!! :)