Hi there,
I have just recently started working out and I also needed to write down a plan to follow. I got lots of exercise tips on here and also spent some time researching work at home workout routines. I keep a sheet where I list all of the various exercises that I learn about and then each 2 weeks I will pick and choose (to mix it up) to create a workout
Here is a sample of my workout plan:
M - LB (lower body)
Thigh raisers (with ankle weights) - 10 reps/5 sets
Bicycle chair (ankle weights) - 5 r/3 s
Squats - 10 r / 2 s
Donkey kicks - 10 r (each leg) / 3 s
Superman - 5 r / 3 s
T - Aquafit (water training/aerobics)
W - Core Training
leg lifts/double leg lifts
Upper Cuts (made the name up

)
Swipers (another made up name b/c I didnt know the official one lol)
Twisters (yet again... see a pattern?

)
TH - Aqua Fit
F - Aqua Fit
S (if I choose) - UB (upper body)
Dumbell Bicep curls
Tricep kickbacks
Lawnmower
Standing oblique twists
Vertical jumping jacks
ok sorry this got kind of long. I would encourage you to find some reliable sites online where you can learn what different exercises work what parts of the body.
Good luck on creating a plan that works for the goals that you have! You can do it! If you find something is too difficult or not difficult enough, you can modify your number of sets, or add/remove weights from the exercise.