Can start with pots, grow-bags, soil and seeds you already have or buy cheaply (roughly Rs 2,000-8,000 for an initial setup of 20-30 containers); scaling to hundreds of pots, as some documented growers have done, costs more over time but can be built up gradually.
Income is highly variable and location-dependent — some terrace growers have reported earnings matching a salaried job after scaling to hundreds of pots over months or years, but there is no single verified India-wide average figure, so treat early income as modest and build gradually rather than expecting fast returns.
Figures are quoted from the sources listed under Useful resources on this page. Check them against current local prices before you rely on them.