Thank you for the detailed description! I will try some of them today. Would 3x10 or 3x12 be an ok amount of repetition to start with?
3 X 10 is fine as a target number, it may take more or less reps each side before you start to shake and loose form, there is no one size fits all when it comes to diet and exercise, the main thing is to stop when you can no longer do the exercise correctly, and if one rep is too much then do an easier variant, but also if you can do a lot with correct form then it is time to make the exercise harder. There is no secret formula, like with diet most diets work to some degree, and it takes time to find what works best for you as an individual. The way I personally train is certainly not the way a person looking to improve basic fitness should train.
Although I am happy to give pointers here on the forum, I am not a big fan of online training/coaching because there is no way to correct errors etc. in real time and I will always err on the side of caution and safety.