Don't bother with 2 and 3 to start with.
A good carpet brush will do to start with.
I still use one most times on domestics.
A good porty like the Ninja will give you
red hot water with it's in tank heater.
Those things can come later.
With your money get a good machine and
plenty of hose and a decent wand.
Get all the tools you need to make the job
easier, decent hand tool etc and a good selection
of chemicals.
I'll stick my neck out here and say I'd buy a drymaster
tool before an agitation machine and Zeta.
John
This is only an opinion...
I don't own and have never used a Drymaster tool, so I couldn't possibly comment whether I would buy one before the Zeta....
What I will say is, you need an extraction machine capable of dealing with a minimum of 400psi of water pressure if you ever opted for the Zeta....
But, the agitation phase is where the magic really is, this is where you have pre-sprayed and you are brushing the solution into the fibres. All too often the customers will be wowed at how the stains on her carpet are disappearing before her eyes... Also, if you buy a TM4 for instance, you immediately have an agitation machine that also doubles up as a VLM (Very Low Moisture) machine.... A good agitation machine supersedes the other 2 options John has given you by miles and miles....
Looks like my next purchase might have to be the Drymaster tool, I've gone nearly 4 years without one so maybe it's time.....
Then again, I've done pretty well hitherto....