新人可以说new comer,当然你也可以谦虚一点说自己green hand(但是这个是没有什么相关工作经验那种新人)
I am new comer here. I hope you can take care of me in the job/position, thanks.
I am a new guy here, so please keep an eye on me, thanks!
I am a new comer here.Please take care of everything.
I am a frashman and please keep an eye on me.