Hello and welcome!
I would suggest looking at the strength-based programs (you can use the filter at the top of the programs page to select for strength).
which difficulty you should choose depends on your both your general health and fitness and how you like to do things.
If your fitness is generally quite low or you like to ease yourself into a habit (or just feel like something is certainly achievable), level 1 programs would suit you well.
Level 2 if you have regular fitness and health levels and are just ready to start.
And level 3 if either you are actually quite fit already OR you just like a challenge to prove to yourself that you can!
Another choice is whether you will be doing body-weight exercise or if you have access to/want to invest in a pair of dumbbells.
Programs to consider: Foundation Light (level 1), Foundation (level 2), 30 Days of Gravity (Level 3)
If you have dumbbells, Ironborn/Ironheart (Level 3 but can be scaled up and down by lowering or raising your weights)
Since you are trying to build muscle, it will be important that you eat enough to actually give your body something to build those muscles with.
This can be a simple as adding a sandwich with peanut butter to your daily routine (or your local equivalent).
In any case, learning to listen to your body is important.
Yes, consistent exercise is good and gives results, but some days it's just better to stick to a bare minimum so you don't hurt yourself
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