How can I add a drivers to my kernel

No problem about the name, it's often mis-spelled. :-)

Anyway, let me second the recomendation for "Linux Device Drivers, 3rd Edition". It's very well worth the money, and serves as an introduction, as instruction, and as a reference. Make sure to get the 3rd edition as that covers 2.6.10 (which is very close to 2.6.9, which is the current microtronix release), whereas the second edition covers 2.4, which while there's a fair amount in common, there's also a lot which isn't (for example, in 2.4 interrupt handlers returned void, whereas in 2.6 they return whether they've handled the interrupt).