If you literally just started lifting a week ago I would start working on core and basics until you get a decent base to you before you do anything very advanced.
I would do one body part per week until you feel comfortable doing more volume, etc etc.
It will seem like you dont do enough but trust me your muscles will need plenty of recovery time since your just getting into it.
I would not go as low as 4 reps until you get a decent bit of strength to you. Atleast until the skakes are gone.
Hear is a basic routine that I would do if I was just starting.
Monday... chest and tri's
Flat Bench 2 warm up sets and then 3 work sets. the work sets should be 10 reps, 10 reps and 6 reps last set.
Incline bench 1 warm up and 3 work sets with same volume basically.
Tri's I would do some like skull crushers or push downs and some seated no weight dips. use your own weight and put legs up on a milk crate or another bench.
Tuesday -Back and bi's
Deadlifts
ride a stationary bike for 5 minutes, stretch back, hams and quads good.
Then do 2 warm up like sets of 15 reps each, then 3 work sets with a 8 reps or so.
Pulldows or light rows (alternate each week)....1 warm up and 3 work sets of 10 reps each.
Bi's I would do 3 sets of straight bar curls for 10 reps each.
Then do 3-4 sets of standing dumbell curls, 10 reps each. (use lighter weight and good form)
Wednesday.... OFF
Thursday.... Shoulders
Seated or standing dumbell or barbell presses.
stretch rotator cuffs and shoulders for 3-5 min. then do 2 warm ups sets of 12-15 reps very light then do 3 work sets of 8-10 reps each.
Side raises 1 warm up set and 3 works sets 10-12 reps.
rear delt fly machine or bent over rear raises. 3 sets 10 reps each.
Friday... Legs
ride stationary bike for 5 minutes, 5 minutes of good stretching or maybe a couple sets of no weight lunges.
Then do 6 sets of squats. 2 warm up sets and 4 work sets. The work sets will start at 10 reps and then 8, 8 then 6.
Saturday.... OFF
Sunday..... OFF or start over with chest, but I like resting and eating all weekend.
Make sure and eat alot of food and atleast try and get the proper protein at the right times. try and get around 50 grams down right before bedtime and around 50 grams immediately when you wake up. then just eat food all day long.
This should give you a good start until you get the shakes gone or just continually increasing volume and start changing routines up once you get comfortable handeling weight and feel confident to do more. You know what I mean about the shakes, everyone one has them when first starting out. When trying to do heavy stuff your arms shake or legs shake alittle doing squates. That will take a good month or two for those to go away, but once they do you will be able to tell and will feel good.
Dont get too complicated and this simple routine will help get a good foundation. I still to this day do a very similar routine just more weight and a few more exercises.
remember you are just getting started and dont worry about how much weight you use but just worry about is your form correct and slow and controlled.