Choose what type of plants you want based on climate, sunlight availability, location of balcony etc.
Choose hanging baskets to keep your plants in.
Adopt the practice of mulching to help retain moisture in plants. Place mulch on the surface of the soil and place bark, leaves, and wood chips to this.
Find information of the requirement of water for your potted plants. Schedule the watering accordingly.
Hi. if you are a newbie in gardening I would recommend to check this plant pot size guide first https://getpotted.com/guide/ I also prefer to use balcony flower pots form Getpotted to make my balcony look like an European. You see, I have been purchasing there for a couple of months already and should say I am pretty satisfied both with quality and delivery conditions.