How do I ground my house wiring?
I get where your endgame is just to plug in 3-prong plugs; OK, the easy shortcut there is fit GFCI receptacles or breakers.  

However, if you want real grounding that  you will depend on for safety and equipment protection, then you need to start at the grounding rods. 

The source of grounding (earthing) is the grounding rods going into the earth. These could be water pipes if metal, an UFER ground if built into the foundation, or grounding rods driven into the earth at the correct locations. 

From these rods, a grounding electrode carries the ground to the main panel.  At the main panel ONLY, there is a bond between ground and neutral. Allowing them to bond anywhere else can create a safety problem. 

From the main panel, ground wires go to each subpanel and up each circuit.  Ground wires can be retrofitted, and we have questions which discuss retrofitting grounds.  

Again, it must start at the grounding rods and go via the main panel.  Do not "island" grounds; don't have an area where the house where the grounds connect to each other but not to the main panel and earth.  This only spreads the danger: if one device has a ground fault, it electrifies the chassis of all of them. 

It sounds like you are struggling with some of the things we are talking about.  We can't provide a full explanation of all things electrical which relate to this issue; that is not our format here. But you'll need that to be successful. Blundering ones way through electrical work is a fire or shock waiting to happen, and knowledge is such an easy thing to acquire.