Congrats on constructing your new house. Kerala has the best plant nurseries which are well stocked and provide plants at a good price.
Buying plants online is a big risk in India for three reasons, 1) the sellers are not very reliable, 2) the pricing is too high 3) packaging and delivery service is poor.
Go to nurseries around your place and look at the plants, make a list of what you like,
Do not decide just based on the price or your likes . Take into consideration the light and watering requirements of the plant. See how much sunlight your garden would get and at which hour of the day.
Discuss this with the nursery managers and then decide accordingly. Plan a colorful but manageable garden. Make sure you group plants with the same kind of water and light requirements. Planting succulents with plants that require frequent watering is a big no,no.
If you consider all this you could have a lovely and manageable garden.