Simply Maid cleaners bring everything. Customers don't supply products or equipment, and you shouldn't use theirs unless they specifically ask.
The essentials (required)
Vacuum cleaner with attachments for carpet and hard floors
Mop and bucket
Microfibre cloths and sponges — plenty, and colour-coded so bathroom cloths never touch the kitchen
Cleaning sprays and products — multi-purpose, bathroom, glass and oven cleaner
Products that make the job easier
Disinfectant and multi-purpose spray
Glass and window cleaner
Tile cleaner and soap-scum remover
Wood floor cleaner and wood furniture polish
Stainless steel cleaner
Oven cleaner (lemon-scented is less harsh — and only ever use it inside the oven)
Toilet and bathroom cleaner
A mild cream cleanser like Gumption for stubborn marks
Air freshener or deodoriser
Tools and supplies
A caddy or bucket with dividers to keep products organised
Scrub pads, a small grout brush and a few old toothbrushes
Disposable gloves
Duster with a long handle for cobwebs and high corners
Squeegee for shower screens and windows
Two-step ladder or stool
Lint roller (pet hair)
Paper towel for toilets, inside ovens and fridges
Rubbish bags
Nice to have
Carpet or steam cleaner — unlocks extra jobs like end-of-lease cleans.
Most cleaners get set up for under $150 at Kmart, Bunnings or Woolworths. Check your kit is clean and working the night before every job.