several questions

Dear teacher:

Thank you very much. Could you please tell me the meaning of the phrases in the following sentences?

a)Sales are up, and our new line of ceramic cookware is a hot seller, no pun intended.
What does "no pun intended" mean here?

b)The project manager should document the project’s goals and assume that the project is a go.
What is the meaning of "go" here?

c)Historical information from the recent blood drive project

What is a "blood drive project"?

[Tdol]

'Hot' is the word the person is referring to as it can mean selling well, but also has the associations with heat, being an oven. It's not a very funny joke.

A go = one to move forward with

Blood drive project = a project to encourage people to give blood (I presume)