>>76294312
>can I just do them on the floor?
You can. It won't be as effective since you can't extend your arms fully but should still get some growth going
>do I just lie down, wrap a band around one foot and raise it up by pulling with both arms?
Nah you tie it to something upright if it's available. You can do the leg raises without it since its basically just a laying crunch, I just thought I'd mention it since you have the bands anyway and they can be difficult when you're starting off as a fat person
>Like 3 dumbbell exercises + 3 band exercises
Meant it more like 3 sets of 10 reps each exercise. Do 10 reps, rest, repeat
>Then progress with more reps and more exercises?
If it's just the one pair of dumbbells then yeah, your progression will be adding more reps each set or doing more exercises per day. Also if you're both fat and completely new, you might need more than a day of rest between sessions. Using muscles your body isn't used to so they'll be sore for a while after. Will take your body a bit to get used to it and you'll be able to shorten your rests as your progress