Future tenses

I would like to ask about future tenses,

I know that there are many ways to express an action in the future:

1. "be going to+ to inf"

2. Simple future "will+ to inf"

3. Present continuous "be+V_ing"

4. Future continuous " will be+ V_ving"

But I don't know what the different emphasis between them.

Here is an example:

At work, I get an email from my leader informing that we will have an urgent meeting tomorrow. I want to inform my mother about this news and tell her not to cook lunch for me at home:

Mum, I.......(1-have)..... a meeting tomorrow, so that I .....(2-not have).......lunch at home tomorrow.

I have several options, but I don't know which I should choose to use,and what is the difference :

For (1):

1. I will have a meeting tomorrow...
2. I will be having a meeting tomorrow...
3. I am having meeting tomorrow...
4. I am going to have a meeting tomorrow...

For (2):

1. ...,so that I won't have lunch at home tomorrow.
2. ...,so that I won't be having lunch at home tomorrow.
3. ...,so that I am not having lunch at home tomorrow.
4. ...,so that I am not going to have lunch at home tomorrow.

Thank you so much.