Help to reinstall OS X

Hi folk.
I'm about to do an erase and reinstall of Mavericks on my iMac, it having been corrupted by some third party apps like MacKeeper and so on. I've previously received some very helpful tips here from people like John Gait, and I've read the suggested material. But there are a couple of things I'm unsure about. I'd be so grateful if someone could read over what I've done and am planning to do, and what I'm not sure about, and give me some advice to keep me on the right course.
I don't have an external hard drive. Well I do, but it's used with my Macbook and I don't want to have two systems on this one disk; I guess it would make things complicated. And I don't have the cash right now to fork out for another one! As backup for my iMac, I have previously used iBackup or I have duplicated vital material onto the Macbook.
The iMac is running really slow, the spinning wheel a common occurrence, despite having stacks of space on the hard drive, and despite having deleted (manually, using EasyFinder, per John's advice) virtually all third party apps. I have copied important files – documents, the iTunes library, and iPhoto pics (as .jpg files in folders, since the library was too large to transfer on my 8GB stick – and transferred them to my Macbook. The Macbook is now groaning under the load, so I will do a Time Machine backup and then delete some larger files which I will restore later when I need them.
What I want is a clean start on the iMac. I'm planning to do an erase and reinstall. But it suddenly occurred to me that when I erase the disk, I no longer have access to the App Store (since I don't have an OS anymore) and can't reinstall Mavericks. Am I confused? In other words, once I erase the startup disk (Macintosh HD) I have nothing. What will happen?
Thanks, from a rookie!

Your profile shows OS X 10.5.....is that really correct?
If you are running a later version of OS X (Mavericks, for example), you would reinstall OS X like this:
OS X: About OS X Recovery - Apple Support
However, I would NEVER do anything like that before I had a good backup.
Barry

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Your original OS X version was 10.5.6. You need to do one of two things:
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Purchase the Snow Leopard DVD so you can install it on the computer.
For replacements:
Apple Store Customer Service at 1-800-676-2775 or visit online Help for more information.
To contact product and tech support: Contacting Apple for support and service - this includes
international calling numbers..
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