I brought a Rannie Yang CD

It's not life-threatening just painful. Thanks for the comment and the revision.

我今日网购了一张Rainie Yang的（音乐）CD. I don't really understand the 一张 part ofthis sentence. I know the sentence is like this in English: I today purchase (past particle) 一张??? Rainie Yang of music CD. I looked up 一张 and got a translation of net. Does it mean internet?

我今日网购了一张Rainie Yang的（音乐）CD. I don't really understand the 一张 part ofthis sentence. I know the sentence is like this in English: I today purchase (past particle) 一张??? Rainie Yang of music CD. I looked up 一张 and got a translation of net. Does it mean internet?

Re: the“张”in the phrase "一张“ is a quantifier like"a disk of, a piece of etc." . It is exclusively used to decribe a group of thing as below:
1. something like paper,hide( = piece of)
2. something like desk or table(just in same way of your saying of "a table"or"four desks")
3. to describe the number of mouth or face(of different people), like"三张嘴不停地说",it just means so many people are talking, or "一张丑恶的嘴脸"， it means "someone is very disgusting to the speaker.
4. to describe the number of bow(五张弓means“five bows”)

Besides张can also be used as a verb, it means: to open/to constrict or contract/to array/to expand/ to look around(I'm not quite sure with the correct phrase to describe the action of look at things very far from the observer,like mountains or buildings far away.)

I am sorry about your illness. It is something like arthritis? I'm a preventive medicine student and I hope I can try my best to do some help somehow.

Thanks for your concerns and corrections. ^^