You will need the following:
A good twin vac machine, with a built in heater, or external if you prefer. ( when you ask about this on here you'll get everyone's personal choice which will help you not one jot.
An upholstery / stair tool
Presrayer, either battery or stainless steel pump up.
Sebo BS36 vacuum or better
Stiff pile brush 15 inch
Soft Tampico carpet brush 15 inch
If you've got money to splash out then consider a CRB machine (contra rotating brush) for agitation.
A range of top quality chemicals and spotters
Buckets, extension cables, rolls of sticky tabs .
Before you buy any of that lot, do a training course for every discipline, carpet cleaning, spot and stain removal and upholstery cleaning - don't skimp on this, you will regret it.
And don't forget insurance which must be all risks cover.
Best person to speak to on this is John Kelly at Restormate, he'll sort you out with what you need and has all the Chems too.
Simon