Chances are you haven't made any errors.
Keep in mind that apple only makes drivers for devices a real mac will interact with. Aside from USB then, they basically only make drivers for components that are on macs. Most hackintosh folk thus try to buy hardware that either matches or is similar too a real mac.
For trackpad and keyboard, try (use a usb keyboard and mouse) installing vooodoops2controller. It's a driver made by osx86 developers and usually gives basic functionality to most laptops. Google voodoops2controller
As for all the other things, from what I gather it is either very flaky or impossible.
Wifi doesn't work, period. You will need to swap out the old wifi card to just be happy with a USB stick.
Ethernet may work but not very reliably.
Audio apparently has recently been activated, google voodooHDA.
Sleep doesn't work http://myhpmini.com/...-10--t1852.html
; this is a little out of date with audio and ethernet, but still.
There is also a guide and set of kexts (albeit 10.5 kexts which may not work on SL) on that website, which you could have found if you had just googled 'hp mini 5101 mac'.
It was the first link.
If you had tried the above and it didn't work I'm sorry for being presumptuous, but otherwise it is a bit rude of you to just start a thread asking you for help. I would understand if a simple google search threw up a huge number of complicated results but a link that says "Leopard on the HP mini 5101" really doesn't need another forum post, does it?