Go to college, get on an apprenticeship scheme, spent 3, 4 or 5 years gaining the required knowledge and getting the neccessary experience. Failing that, at the very least phone around and get some work as a mate for a competent and local domestic electrician and spend a few years learning from him. Then and only then you should be competent to carry out the work you are asking questions about.
This is really really really basic stuff that if you have to ask questions about then you shouldn't be carrying out the work. For now, I recommend contacting a qualified electrician and have him carry out, test and then certify the work.
If you would like to PM and have me (or any other decent spark on here) do the job for you over the internet we can discuss charges for our time and expertise then.