How can I get the training I need to become a caregiver?

I began working as a caregiver almost a month ago. My boss is a family friend, and she emailed me one day asking if I would like to work in her carehome part time....and that she would train me. Well she has given me almost NO training. I know she is glad to have much needed free time. But I feel really neglected. I am caring for four adults, she leaves me alone with them, and it's just too much. I try to use as much common sense as I can, but I really need advice. When I ask her, she acts like she wants to roll her eyes at me, acts annoyed, or just says, I have to just "do it" (whatever the task is at hand) These are examples: getting them to brush their teeth, take all their medicine, or allow me to help when going to the bathroom. My boss wants me to be in there with them, and make sure their pants are pulled down all the way so they dont make a mess on their clothes. But when they go into the bathroom and shut the door, and don't want me in there....what do I do? I just started, so I don't know ways around things like this. And sometimes, I am so busy with meal preparation, or other residents, that I don't realize they've gone into the bathroom, until they are already in there. My boss is European, and has her own ways, but she makes me feel so stupid for asking. And I know these aren't stupid questions, because How am I supposed to know....not ever having done this before?? I'm a very caring and gentle soul, and I understand how hard it is for the residents, and I'm trying to respect their privacy. But knowing that I need to assist them, I am stuck between a rock and a hard place. I need to know what words to say, or tips or tricks to assist me with this. She says she is going to send me to classes at one point. But for the time being, she acts rushed, and never wants to be around, she is always leaving. I don't even think it's legal at this point, to leave me alone with them. I want to stay in this line of work, but this isn't working out, I don't think. I'm so tired and frustrated. Help!