If you have any space in and around your house which receives sunlight for at least 3 hours in a day, is an ideal place to start.
A balcony/ open terrace/ window grill are ideal places to start!
If you do not have a space constraint, I would suggest you start with one or two Rose plants. Rose plants require a pot size of minimum 6 inches and a maximum of 10 inches. It is best to choose a Rose plant with strong stem formation. Rose is a sturdy perennial plant. It flowers throughout all seasons.
If you have a space constraint where in you cannot fit in big plants like Rose, I would suggest you to go for small flowering plants like Chrysanthemum and Marigold (dwarf variety) in a pot size of 3-4inches.
Flowering plants are the best ones to start with as they require very low maintenance as well as they give us lot of scope to learn.
The plants need to be watered regularly (daily). Different plants have different water requirements. Excessive watering creates equal stress on a plant as inadequate watering. I will be discussing about different plant stresses in detail in my upcoming articles.