Using wp_query to show a random post from a specific category

Hi I need some help with a wp_query script. Here’s what I need to do.

1: Make an array of all the posts from the ‘Events’ category that have a value in the ‘articleimg’ cutsom field.

2: Return the value of the ‘articleimg’ custom field, and print it inside a IMG tag.

3: Print the title value of the selected post, and permalink it.

Thanks in advance