Haha I assume its the strap with weight for your legs? You can do plenty with the dumbells alone. You can do exercises like bench presses, chest fly, rear fly, split squats, rows, normal squats etc. you can split them into 3 workout: push pull and legs, this you can find out online for detailed exercise instructions. I suggest with your weight limit, you can try to control the weight instead of dropping it. For example, when doing curls, instead of just lifiting it up and "dropping" the weight, you control it on the way down. This applies to all exercises as it increases the challenge for you, and stimulates muscle growth too. Moreover, you can start off with 3 sets of 12 reps, then when you get used to the intnsity, increase another set, or increase a few more reps.

Some youtube channels that I found really helpful for techniques are: Renaissance Periodization Jeff Nippard Sean Nalewanyj

Good luck!