Look up a book called Starting Strength by Mark Rippetoe. Here is a link to the wiki for the book http://startingstrength.wikia.com/wiki/Starting_Strength_Wiki
If you have never done any type of strength training this is the book that will get you to where you want to be. It covers the basics of each of the 5 lifts that you will be doing on the program, squats, deadlifts, press, bench press, power cleans. It also has a section on nutrition, and at 6'3" 145 lbs you are the perfect candiate to put on some muscle if you eat, eat, eat. This is a no frills program, just hard work.