If you're new to lifting, just about any lifting will get you some strength-gains. But since that will dry-up soon, it's best to switch to a program more focused on your goals. If you're going for overall strength, i.e. plain-old functional "I'm stronger than you" kinda strength, you're probably going to need to be lifting more weight for fewer reps.
Since you say you're a complete newbie to lifting, allow me to elaborate: Your body will adapt to whatever you try to make it do. If you lift heavy weight, you will get stronger, if you lift light weights for many reps, you will gain endurance. In reality, it's not quite as cut-and-dried as I've described here, the human body is ridiculously complicated, but the basic rule-of-thumb that you need to remember is: 1-6 reps for strength, 6-12 reps for size, 12-20 reps for endurance.
The KEY principle with any program is you need to achieve muscle-overload. You need to push your muscles past their existing limits in order to gain. At the end of each set, whether its 200 lbs for 3 reps, or 10 lbs for 20 reps, you should be tired. This is sometimes called 'Training to Failure' i.e. lift the weight until you cannot physically lift it again. How you get to the overload point will determine how your muscles will adapt. Make sense?
If I was where you are now, knowing what I know now, I would do the following:
1.) Test what your strength-limits are for bench-pressing, deadlifting, squatting, and for muscle-balance purposes, I'd test your weighted pull-up as well. Just take a workout day for each and see just how much weight you can bench, squat, etc. Warm-up fully, and add weight slowly. Read-up on T-Nation on how to do these exercises safely and with good form. Once you "max-out" on each exercise, the max weight you lifted is your 1-rep Max, usually abbreviated around here as 1RM.
2.) Write your 1RM down in your exercise-log. If you don't have an exercise-log, start one. Just use a regular old notebook, or even Microsoft Excel, if you're technically inclined. Anything to keep track of when you work-out and how much of each exercise you've done.
3.) Determine and write-down what your goals are. These can be long-term, or short-term, but it's best if they're measurable, i.e. "Bench-press my girlfriend's body-weight" is a bit better than "Be Stronger". Define for yourself what "Pure Strength" means.
4.) Find or design an exercise program that drives you toward your goals, and that fits into your lifestyle, time restrictions, equipment availability etc. The greatest program in the world is no good to you if you don't have the time or the gear to do it.
5.) Lift Hard. Keep good form. Don't get injured.
6.) Re-test your 1RM every month or so. If you're increasing, great. If not, you should think about changing something in your program.
Finally, keep reading. You can find all kinds of good information online. There are plenty of people online who want to tell you how you should work-out. Just keep in mind what your goals are, and what the goals of the author are. In other words, don't throw-out your existing program just because you read about Arnold Swzartezeneger's leg workout in Muscle and Fitness. Be wary of anyone trying to sell you something.