Thanks for the extra details!
The good news is that you can practice drop with just about anything your dog grabs. So if he is eager to take food, you can try to practice with some type of food that is quite large, safe and your dog in unable to eat or gulp down quickly. For instance, one of my favorite foods I like to practice drops is a big chunk of dry bread. This is hard to eat all at once and even if in worse case scenario, he would end up eating some, it's bland and won't cause big issues. On top of this, it offers a good starting point as it's perceived as lower value to many dogs.
Of course, to get the dog to drop, you have to use something that is perceived higher in value than bread such as a treat that is meat-based. Studies have shown that most dogs tend to find meat more valuable. Once he gets the concept, you can then practice your drops its when out in the yard if you happen to notice your dog spontaneously grabs a stick or something else he shouldn't have like the remote control, your slippers etc. Of course, never place items/foods that can pose a danger to your dog purposely on the floor to practice with!
His lack of focus is likely due to his lack of training. Eye contact is important as it opens the lines of communication. The Airplane game and Look into my Eyes game can be helpful here.
For the other issues, feel free to create a new thread on that topic with more details (the more the better).