park, im a bit noob about this

i've always wanted to know the true cost of this. but land in KL walao can get below <1m i respek.
do you need to have cash for land purchase? is it like purchasing a new house? 10% upfront etc.
last time i check around my area residential land PKNS selling for 800k
i think about 80x80 kot. for me if i can build 40x60 bungalow enough, then make an area for garden and big ass tree

KD, quite decent area albeit a tad further inside.
https://www.pkns-property.com/all-properties/land-for-sale/70-land-for-sale/751-bangunan-kediaman-lot-no-4-jln-rimba-riang-9-4-seksyen-9