Well there is a wealth of information out there, one good book to consider is "Telecommunications cabling Installation" published by McGraw Hill and put together by BICSI. It is based on the BICSI Telecommunications Design and Distribution Methods manual which is based almost entirely on the EIA/TIA standards. To properly answer your question of 'how' would take pages. There are many sites on line that have some examples and information, though many are aimed at home type installations.
And of course you may find a variety of misinformation as well. In Oregon, the work you are talking about requires an electrical license, a contractors license, an electrical permit and an inspection. I don't know where you are, but you should certainly check on what the requirements are. Also check your liability insurance, if you are new at this and you happened to damage something or cause damage to the building you sure want to be covered. FYI, there is no reference in the EIA/TIA standards to more than one kind of Cat5e. Many vendors would like to sell you the hype of several different types. While there are differences in some of them, mainly the bandwidth that is available, the standards only recognize and define parameters for only one Category 5e cable.
Testing is of course another issue, a good wire scanner capable of testing your installation could be $5,000 or so. Without it, you cannot prove to the customer that you did the job correctly.
Lots to consider, good luck, please get the book or something similar before you start. Besides the above things there are fire codes to deal with and you certainly don't want to mess up in that area.
Good Luck!
It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com