I have 2 partitions on a harddisk and I wish to install both OS9 and OSX. What do I have to do? Install OS9 and then OSX? I am new to MAC's.

thanks

I'd recommend that you install OS9 first on the smaller of
the two partitions..once it's done you can just go ahead
and install OSX on the other, so that if there's any problem
you can always boot into 9 and have full functionality..
If all you want 9 for is classic compatibility you don't
actually have to have 9 on a seperate partition, IF your
using OSX10.3, then it can just be on the same partition
right next to the OSX system folder (maybe in 10.2 also, i
don't know)
10.1 however cannot have OS9 on the same partition as
OSX, so then you'd Have to install on the other.
The OSX install will not, in any case, affect your OS9
partition in any way, although it might add a few classic
compatibility files if you choose it as your classic folder,
the first time you run classic.
If your just going to run 9 as a standalone OS, then, as I
suggested, install it first...

thanks for your info. Another question pls: after installing os9, I just boot from osx and recognizes that there is another os and makes it dual boot? (like windows, with the selection before windows starts). And will it do it automatically or it asks me to have dual boot or so?

thanks a lot

In OSX go to system preferences, startup disk select the one you want and click restart.
In os9 it's in control panels..startup disk control panel..