I'm green. = I am new to sth.= sth is all new to me.

1.Saying "I'm green" signifies that you are unfamiliar or new at the subject or matter at hand.
对某事不是很熟悉，在某方面是个新手。

2.Think of a marigold (flower). When the stem first comes out of the soil, the only color visible is green. Once it has done more growing, the actual petal color becomes visible and eventually blooms into a beautiful, colorful flower.
想象一下，一朵金盏花，一朵花儿，它的茎刚从土里钻出来的时候，你只能看见一点点绿色，得继续长一段儿时间之后它才会开花，你才能看到其他比如说红的紫的花瓣儿的颜色

3.Even though I have been studying English for a few weeks, I'm still green.
尽管我已经学了好几周英文了，但是还是个新手。

4.Can you explain how to find my IP Address? I'm new to the internet.
你能教教我怎么找到我的IP地址吗？我在电脑方面是新手。

5."You must think that I'm stupid You must think that I'm a fool You must think that I'm new to this But I have seen this all before"
你肯定觉得我是个傻瓜,你肯定觉得我愚蠢至极,你肯定会觉得我还不熟悉,但我只能说一切我已看尽.

6.I'm an expert (at doing). It means I'm very good at something or I have a lot of knowledge about something.
我(在某方面)是专家。我很擅长(做某事)。