Maintenance and Insurance

Hi all,

I've been interested in flying for a long time, and I'm finally hoping
to be able to get my PPL and work up from there.

At the moment I'm trying to research what kind of plane I would like to
look into owning either before or after I get my PPL. I have a few
questions for those of you who already own airplanes.

Firstly, Insurance premiums. How do insurance premiums compare between
fixed gear single engine, retractable gear single engine, and
retractable gear twin engine planes?

Secondly, Maintenance and Fuel. How do maintenance and fuel costs
compare between single and twin engine planes?

Third, do maintenance and fuel costs differ majorly between a new
airplane, and an older (20-40 years) airplane that has been taken care
of?

Fourth, what is the biggest difference between owning a twin engine
plane, as compared to a single engined plane? What are the benefits
and drawbacks?

Finally, is it possible to learn for your PPL in a complex and/or twin
engine airplane? What would be the benefits and drawbacks?

Thank you for any help you can give me,
Chris