How to draw two-intro eukaryotic gene?

Draw a two-intron eukaryotic gene of DNA and its pre-mRNA and mRNA products. Be sure to include the promoter, transcription start site, transcription termination site, untranslated regions, labeled 5′ and 3′ ends of DNA and pre-mRNA and mRNA, introns (at least two) and exons (at least two), and the processing events required to produce the mRNA.

How do I even start this?
Do I just do a simple line drawing of this? I know what like a simple gene structure would look like, but I have no idea how to incorporate the processes. Has anyone ever drawn something like this?

Would appreciate any assistance! Thank you!