Hi,
I saw nobody hooked you up with an answer yet, so in case youre still wondering:
1st
Basically, once the Apps youve downloaded are on your new Mac, you should have no problem just double clicking them, and the "Installer" will begin, and by default your apps should be installed into the systems "Applications" folder/section.
(Open up a finder window, you can click on the little Mac Face in your dock, and one will pop up, on the left youll see a Network Icon, a Hard Drive icon, then icons for Desktop, Applications, Documents, etc, click on the Applications one, that will bring up all of your installed Applications, check to see if the ones youve installed are in there)
If not, open a finder window, on the top right youll see a searchbar, search for what youve downloaded and tried to install, when you click on one, the bottom of the window, will show you where it is, if its in anything besides the folder youve put them into, throw them away for now, and empty your trash)
Go back into the folder youve put everything in. Open one up, double click on it, this is when one of those white "Drives" you were talking about should appear on your desktop, double click to open that up, inside will be that App youve downloaded.
Then, just drag it into that "Applications" icon thats on the left of the window, it should be installed from there, then repeat.
So, those "Drives" that show up, are what appears when youve downloaded an application, its where the app is located.
This is basic stuff, you should be set, if it sounds complicated, do it a few times, youl be like a trained monkey man!
Bryan