First,Please welcome to today's little English teacher这句话对吗?

不对，请问你想表达什么意思啊

不对，如果要改的话应该改为
First, please welcome the little English teacher of today!

不对,little english teacher 是贬义的,没有小老师的直译. 可以说 special english teacher.

First, please welcome today's English teacher**** 为什么要"little"??? young 比较好吧？