I got some questions about english grammar again.

Please judge the sentences below :

[Waited Socola to come online for 5 hours but she is still offline now] should i say :
I have been waiting for Socola to come online for 5 hours already and now I am still waiting.

[Waited Socola to come online for 5 hours and finally she onlines] should i say:
I had been waiting for Socola to come online for 5 hours already and she finally onlines now.

[Waited Socola to come online for almost 6 hours but she is still offline now]should i say :
I will have been waiting for Socola to online for 6 hours already and now I am still waiting.

Besides, I want to know is there any differences between these sentences :
1. I have given the cake to Sam already.
2. I gave the cake to Sam already.

Please reply me as soon as possible, thank you very much