All of the prior suggestions will serve you well until you need to deal with a problem. RJ45 plugs and jacks come in two flavors; 568A and 568B. The difference is that between one and the other the orange and green pairs are transposed so now line 2 as represented by pins 3&6 are the green pair instead of the orange. You need to learn the color code and get tracing equipment(toner and probe). The Microtest line tester and scanner(I think Fluke sells it now) can replace the toner and check absolutly the correctness of your cable. Siemens makes a really good one also for approx a $150 less but it will not measure cable lenght. It is recommended that you learn the USOC color code. Primaries are white, red, black, yellow and violet. The secondaries are blue, orange, green, brown and slate(gray). You may want to limit yourself to two line phones but if you need to work with previously installed wiring(and Murphy's law most definately applies) you will need this equipment and knowledge. There is no free lunch.