Once the Architect mark four boundaries of the place where your house will come up,you will have to clear that space by removing or cutting down trees or any other items that may exist in the space.
While cutting down trees make sure that you remove tree routes also.Removing root of the tree later will be difficult after cutting down top above soil portion of the trees.
It is better not to do any leveling or filling of the space before foundation work except in case of piling foundation where you will require a clear level filled space.In the case of rubble foundation,you can do the filling after foundation rubble work is done.
After the site is cleared your architect will have to do set out of the building at site.In some cases Architect may issue a Set out plan of the house and work in charge may do this set out work.But it will be better to do this very important step of construction in presence of the person who designed the house as he will be able to make any minor changes if required on the spot.
Set out of the plan is nothing but drawing plan of your house on the land where it comes with strings and posts.Traditionally it was called as “Kutti adi”.Central line of the brick wall is drawn by using strings and wooden posts.