It seems challenging, but you'll find it pretty straightforward once you've done it.
The tower will give you a direction to turn (often "early").
Look for the big bridgey looking thing just in front of the big smoke stackey looking thing (all technical terms) due south and track for the highest bit (try not to hit it)
About the time you get to the bridge, they will tell you your outside of CTA, sqawk 1200 and 135.7 and off you go.
**warning** this is a busy little piece of airspace, and your best bet is to track south a little further to williamstown , then turn right remaining south of a lake near Altona. Keep a good lookout.
If you dont wanna overfly point cook (or the restricted area is active), then you can track to BOM tower (A big golf ball looking thing).
With avalon, 2500-4500 (careful of when you can climb above 2500) you wont need a clearance, but they do like an advisory call.
Below 2500, sqwawk 3000 and request a clearance. (its the same coming back the other way)
Good luck.
PS - Hassle your instructor for all this and any other info you can. Thats their job.