Mid-2007 MacBook (MacBook2,1) - Software Restore disks
The last version of OS X compatible with your Mac is OS X Lion 10.7.5. I assume that you have not purchased Lion from the Apple App Store and therefore can not download a copy. The path to store the Mac from scratch would be as follows.

Install OS X Snow Leopard 10.6. AFAIK, Apple no longer sells this DVD. You can try to purchase a used copy. A free ISO can be downloaded from the internet. You can then either burn to a DVD or create a bootable USB flash drive installer.
Upgrade to OS X 10.6.8. This is a free download from Apple. I should point out you probably will not be able to download this update from a OS X 10.6 install. In other words, the version of Safari is to old. You should attempt to download to a flash drive in advance or use another machine to download to a flash drive.
Upgrade to OS X 10.7. This is available from Apple for 20 USD. This purchase is for a download of the software to upgrade from Snow Leopard.
Upgrade to OS X 10.7.5. This is a free download from Apple.

Because of the age of the Mac, you should consider abandoning OS X altogether in favor of version of Linux. What would be available for your Mac depends on the amount of RAM installed.
Debian with desktop has a 512 MB minimum and recommends 2 GB or RAM.
Xubuntu with desktop has a has a 512 MB minimum and recommends 2 GB or RAM.
The current Debian ISO can be downloaded from here.
Ubuntu is a popular Linux. However installing requires 4 GB of RAM. Xubuntu is basically the same, but with a Desktop interface that requires less RAM.
Note: Due to the age of your Mac, Linux probably should be installed to BIOS boot. I have installed both Debian and Xubuntu on a 2007 iMac with 4 GB of RAM.
I assume you have the memory split as 1 GB + 512 MB. The maximum memory is 3 GB. You could upgrade by replacing the 512 MB with either 1 GB or 2 GB. OWC seems to still sell memory for your model.
You probably could install 32 bit Windows 10. The 64 bit version would require a memory upgrade to at least 2 GB. The drivers can be downloaded from this Apple website. I was able to install 64 bit Windows 10 on a 2007 iMac using the 32 bit Windows 7 drivers. You can download and try Windows 10 without a purchase, but to keep using requires purchasing a license. IMO, Windows probably would run to slow to justify the purchase of a license.

If you attempt to install a current release of either Linux or Windows 10, you should expect to run into unforeseen problems which may be solved by posting a new question.