Open the App Store and login to your account. Under the list or your purchases, Mavericks will be in the list with a button at the right for Download. Click that to initiate the download.
When the download is complete and it wants to start installing Mavericks, just let the initial screen hang and go back to the desktop. Copy the full Mavericks installer somewhere else. Then go back to the installer and quit. The only reason to do this is sometimes quitting will cause the installer to be deleted when it shouldn't, then you have to download it all over again. If it doesn't get deleted, then just remove one or the other yourself.
Mavericks is too big to fit on a single later, 4.7 GB DVD. You'd have to have a dual layer disk, and I've never tried that. Besides, it's truly snail slow to boot to a DVD for installing. You'd be much better off buying an 8 GB flash drive and making your own bootable, full installer. That can either be done using DiskMaker X, or following any of the various instructions on this page. It says for Yosemite, but all of the same instructions should work for Mavericks. I've always used DiskMaker X. It works, it's automated, and it's simple.