Default [Q] help with rooting and flashing custom rom for htc mytouch 4g

I have a htc My touch 4g. In bootloader mode it says locked.
Glacier pvt ship s-off. Hboot-0.90.0000. Micro p My emmc is, m4g2de. am running android 2.3.4. i just bought this phone so My questiOn is what method shold i use for rooting? Please help me,out . Thanks.