You are presumably asking about rights issues and bonus issues?
A 1 for 1 issue means that they issue 1 new share for every 1 existing share. So if someone owns 100 share at the moment they are issued with another 100 new shares.
A 1 for 2 issue means that 1 new share is issued for every 2 existing shares held. So if some currently own 100 shares they will be issued with another 1/2 x 100 = 50 new shares.
I don’t understand your second question – 400,000 shares x $1 = $400,000!
Have you watched the free lecture on limited companies where all of this is explained?