Yeah dude. Take it easy. I know your feeling. Starting out, anxious, etc. But remember, Rome wasn't built in a day. If you overtrain, you're just gona get hurt, and in the end, lose out on working out, which is what you don't want. Hit body parts once a week, rest at least a day inbetween, get your nutrition to par, and most importantly, FORM, FORM, FORM. Don't worry about weight yet, till your form is perfect.
There are many exercises that are not all about weight. For ex, did a killer quad workout today with weights that were super light. Yet, I could barely do 30lb leg extensions at the end!
My Quad killer:
1. Rear foot elevated Split-Squat (elevated leg on bench)...(4 sets) 95lbs - 10 reps ea. leg
2. Front Squats - raised heels - (4sets) 95lbs - 10 reps
3. Leg Press - (1 set) - 90lbs - 100 reps
4. Step up 2 bench holding 25lb plate - 3 sets - 12 reps per leg
5. Ski Squats (90deg leaning against wall)- 2 sets of 30 secs holding 10lb plate; 1 set 20 secs no weight
6. Leg Xtensions - squeezing n holding at top - 2 sets - 30lbs(LOL)- 5 reps