Hi! Glad to hear your trying Linux out. Linux is more complicated then windows but more power and secure if managed right. So when things get tough just post on some forums and use google. http://howtoforge.com
has alot of useful information on it. Now to answer your question.
By default you can boot windows and install it inside windows which is easier but I would recommend booting the ubuntu from disk and installing it that way. When you get to your partitioning scheme be sure you select the 2nd hard drive you want to install and just follow the steps. It will do the rest for you and even import some user accounts and/or Documents from windows at your request.
Ubuntu installs grub and should auto detect windows and add it to the /boot/grub/menu.lst. By default it will boot ubuntu. If you would like to boot windows by default you need to boot into ubuntu and then goto Applications>Accessories>Terminal and type
This is ubuntu 9.04 if you use a version that is newer it may use grub 2 as trdegar said. I haven't seen it yet so not sure.
Please note you may want to look up on how to use vim editor online. You are welcome to use any other type of text editor as well. Just don't use a word processor unless you save it as plain text. This tutorial below is down with vim editor.
sudo vi /boot/grub/menu.lst
<enter your password>
Scroll down to
Press i and then Change the 0 to 3
Then press your insert key or i hit Esc next Shift+zz to save
If you copy and paste your /boot/grub/menu.lst
Now if you delete Linux in the future and just want windows you have to fix the mbr by booting from your windows cd and enter the recovery console. Select your install and type in your administrator password and type
This should fix your Master boot record for windows only. (Please note if you do this with a Linux installation still exsisting you can only access it by booting your linux from a Media source such a cd,usb,etc. You would have to reinstall grub to boot linux from you harddrive)
Hope this helps
good luck to you.