to the OP,
while it is true that you have a great deal to learn, please make a special effort to research videos online that detail the proper FORM of an exercise. it isn't enough to have a cornucopia of exercises if you don't know how to perform them properly, and it may actually be detrimental for you.
when i first started, i was unaware of the importance of proper form. i had only sought to mimic others in the gym that i assumed knew what they were doing (and many, many people in the gym don't really know what they are doing). yeah, don't do that, unless you want to have chronic injuries later down the road as i do.
i would also HIGHLY recommend that you bring a small workout journal with you to the gym. plan your workout in advance and then, during your time in the gym, see yourself as your own experiment. you do an exercise you've planed out at a certain weight you predetermined for a predetermined number of repetitions (based on whatever workout plans you may have found online). if the weight is too heavy for you to complete the number of reps in your set, take note of it and scale down. if you feel that you could complete the set, but your form was poor, take note and adjust for proper form. proper form trumps heavier weight! if you can't complete the number of sets you had planned out, see if it was because of muscle failure or because you were just too tired (which would then point to your nutrition, which is WHOLE other ball of wax). you are the david that you are sculpting.
every time i go to the gym. i bring my workout journal (small notepad), a stopwatch, a bottle of water (because i hate to waste time going from an exercise to the drinking fountain, and i'm following a certain rest interval between sets and exercises anyway). i always take note of how my form was, if i felt any pain, how i felt during the exercise, and if i should increase either weight or reps or sets. i don't take super-details notes (that would waste time; i'm on a limited rest interval), usually short sentence fragments, but it is enough for me to gauge my progress.
i've also noticed that i'm the only one at my current gym that does this, and i do get looked at because of it. i don't care. i have my ipod playing, i'm in the zone, and i know what i'm doing. i don't care that i can't lift as much as thundarr the barbarian lifting next to me. i'm not in the gym for him (well, unless he's hot. nah. even then.), i'm in it for me. and i think i look pretty damn good for a guy pushing 40 years. and i am also taking special care of my shoulder that i screwed up when i was younger because of bad form. safety first, young padawan, safety first.
nothing wrong with being a beginner. beginning mind. zen mind.
i hope my rambling helps you. be well.