David,
Definitely start playing before before your lessons start. However, if you are not sure about how to assemble & disassemble the oboe, you may want to wait, or be very careful. Also, expect reeds to be problematic.
Check out the following web sites, if you need some info on getting started.
http://www.foxproducts.com/pg_oboe.pdf
http://www.oboeguide.com/
I posted an answer to your reed question under the -- RIEC -- topic.
If you have questions, post to this board for help.
Good luck,
Bill_C