​There are a bunch of different ways in which you can approach your strength training, and there are a range of tools you can use for different exercises too.
The imaginary barbell game is what we play, every time we lift dumbbells with the hands rigidly aligned in relation to each other. We don't need to do this. The strength of dumbbells is versatility – they are less stable than a barbell, but more versatile. So they don't lock you in, you don't need to align the hands as if you're holding on to a single, long bar, and you can move in the way that suits you best.
This is a topic I believe is better watched than read, so if you're curious about variations to the bench press, shoulder press, or how to approach training with weights, please check out my new video about this very issue.
​​"Can you help me lose weight and keep it off?"
If you are going to pursue weight loss, find out what the statistics are for people to maintain that loss via your chosen method or by any method at all, not at the 8 week mark when they seem successful, but at the 3 year and 5 year mark (usually less than 5%, and that's being generous, if there are even studies that went on that long - rare). Find out how much weight loss they count as a success (usually 5kg or so). Find out how many people were even able to maintain the diet for the duration of the short study (dropout rates are usually high). If your doctor suggests weight loss, ask them for these figures as well.