How To Workout?

I am having trouble working out. I don't know if it is just my procrastination that is making up these problems or if this legit, but I need a guide(video or text) to help me figure out what to do.

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I currently cannot do a gym/personal trainer route. I have adjustable dumbbells at home, I have not lifted weights before. I can find countless videos and posts of people showing the exercises online but no one ever talks about what weight to use. I am a complete beginner(noob) and I have no idea what weights to use for what exercise.

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Are there any guides that focus on this? I want to start working out, the idea of strength training/lifting weights is exciting to me but I just feel a bit lost.

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Appreciate any help! Thank you! :)