I know nothing about rooting or loading custom ROMs on an Android phone so sorry if these questions sound stupid/obvious.
1. If I root my phone, do I have to install a custom ROM to it?
2. If I root my phone, will that prevent me from receiving an OTA update?
3. Is it possible to root your phone, and only enable wireless tethering without installling a custom ROM? (i just want to root my phone for wifi tethering, and cpu over/underclocking)