Here a repair site for the MacBook http://www.ifixit.com/Device/MacBook_Unibody_Model_A1342
For a hard drive try Newegg.com http://www.newegg.com/Store/SubCategory.aspx?SubCategory=380&name=Laptop-Hard-Dr ives&Order=PRICE
Here are video instructions on replacing the hard drive on the White Unibody http://eshop.macsales.com/installvideos/macbook_13_09_unibody_hd/
To transfer your current hard drive I like the free application Carbon Copy Cloner. It makes a bootable copy of everything on your hard drive http://www.bombich.com/index.html You'll need a cheap SATA external hard drive case. Put the new drive in the case then partition and format the new drive and clone your old drive to the new one. Check that it's set up right by booting up from the external drive. Then replace your old hard drive with the new one.
Here's a cheap SATA external hard drive case on Amazon. http://www.amazon.com/Vantec-NexStar-2-5-Inch-External-Enclosure/dp/B002JQNXZC/r ef=sr_1_1?ie=UTF8&qid=1332118549&sr=8-1
You can get a new third party power adapter on eBay for about $20
http://www.ebay.com/sch/i.html?_nkw=macbook+power+adapter&_sacat=0&_sop=12&_dmpt =Apple_Laptops&_odkw=macbook+power+adapter&_osacat=111422&_trksid=p3286.c0.m270. l1313
You can order a Snow Leopard 10.6 install disk for $29 as long as you have at least 1gb of RAM and 5gb of free space on your hard drive. http://store.apple.com/us/product/MC573Z/A?mco=MTY3ODQ5OTY
A 10.5 Leopard disk will run you around $200
To upgrade your iLife and iWork. If you only want iPhoto or other single apps from iLife '11 you can get them from the App Store after you've upgraded to 10.6.6. iPhoto, iMovie or Garage Band for $15 each and Pages, Keynote or Numbers from iWork '09 for $20 each.
To test whether it will work see if you can borrow a power adapter and an install disk from your daughter. See if you can boot up the MacBook from the install disk in your CD/DVD drive.
Any 2.5 form factor SATA hard drive will work in the MacBook. You will have to format it for the Mac since most of them come formatted for PCs.
To format it put your install DVD into the optical drive and reboot. As soon as you hear the boot chime, hold down the "c" key on your keyboard (or the Option key until the Install Disk shows up). That will force your MacBook to boot from the install DVD in the optical drive.
When it does start up, you'll see a panel asking you to choose your language. Choose your language and press the Return key on your keyboard once. It will then present you with an Installation window. Completely ignore this window and click on Utilities in the top menu and scroll down to Disk Utility and click it. You should see your hard drive in the left hand column along with your other drives. Click on the drive and select the Erase tab. Set the format value to Mac OS Extended (Journaled) and click the Erase button. After that has finished select the Partition tab. Type in a Name for your hard drive and select how many partitions you want from the Volume Scheme. The usual setting is one partition. Click on the Options button after you've selected a partition to make sure it's set for GUID. Then click the Apply button and after the Partitioning is done quit Disk Utility.
You can now follow the instructions on the install screen