Its about 450,000 to 522,000gp at grand exchange
Go to the place with the house icon in varrock.
You can eat cake anywhere, the best place to make it and eat would be at a player owned house.
A best place to catch it would be Catherby, along with most other fish.and at ur moms house
You can place on in your workshop.
The Wilderness.
There is a guy called Lonezer0, he has 99 construction.
Fishing guide
no you can not sell your house on runescape.
The best place to kill zombies is at the armor zombie place. IT is where everyone get 99 str.
stronghold of secutity i like
Living Rock Caverns