Have lots of money, there is no cheap way of doing it. If you are combat level 70+, try killing green dragons and selling their bones, this is a quick way of getting money.
There is a guy called Lonezer0, he has 99 construction.
FINROCKS!
Creating oak dungeon doors using Stealing Creation hammers
The brimhaven Agility Arena.
Just keep building the highest level items you can at your house, and every time you get a lamp from a genie, use it on that.
Buy 7m raw beef. cook. if your not 99.. haha for trying this.
The best way on runescape to get 99 attack is to get 70 def 70+str the higher the better in str and the def is so that you can wear guthans.Then all you have to do is go to bandits and camp there
a lot....
The best way to mix concrete for home construction jobs is with a wheelbarrow and a stiff rake. There is no heavy lifting involved and if you add the water before the mix, no one will mess it up.
The best way to find an excavator construction site is visit the town hall an ask where there are excavator construction sites in the city. There they will be glad to help you.
Topic headings in your outline
Well I do not have 99 magic nor do I have 72 magic, the best way is if your a member to use your best member spell, if not use high alch. I have experience with magic as mine is 47.