Make sure the soil is a well-drained soil that keeps a bit of moisture to it.
Most Garden supplies around the local area sell a nice garden blend soils that has a mix of compost/sand and topsoil.
Dig the hole a little bigger than the pot size and it doesn’t hurt putting a compost or a slow-release fertiliser like osmocote in the hole before planting. If the soil is dry it might pay to fill the holes up with water and let drain before planting.
Remove the pot from the root ball and plant
DO NOT TEASE THE roots. The soil level of the pot should be the same height as the existing soil.
Mulching with a leaf mulch or pea straw always helps keeping the moisture in the ground.
Bamboo does require special attention whilst establishing.
Frequent watering is required for the first month or 2, The root ball must be kept moist. If irrigation is installed choose a high emitting dripper straight to the root ball and stay away from techline. Sometimes the frequency of watering can be up to twice a day depending on the weather conditions. Keep watering even if it rains whilst establishing.
Bamboo loves a high nitrogen fertiliser. You can feed your bamboo every few weeks with Thrive all-purpose water-soluble fertilizer or similar. You can also feed your bamboo with any lawn food as well as per product direction. The soil around the bamboo roots benefit with frequent applications of seasol or equivalent. When the soil is happy the bamboo will be happy