When So using? When do I use, "So"?

I need your help, in use "So". I need your help in using, "So". 
Thanks so much.   (Meaning - It is adding emphasis to "thanks", making it greater. )

Thanks! 

Thanks so much! (More feeling)

Examples:

I think so.  (Meaning -I believe this to be true.)

I think so, too. (Meaning - I agree.)

I don't think so.  (Meaning - I don't agree. )

So, what do you think? (Meaning - Asking someone's opinion after consideration of some said or seen, prior to, and taking these things into consideration. 

I so much want to help!

(very much)

Anna

When do you use "so"?

I need your help, in use "So".
Thanks so much.

When So using?

I need your help to use "So".
Thanks so much.

When do I use, "So"?

I need your help in using, "So".
Thank you.