Learning names will be the least of your problems. Read up on dementia and depression, HTN, and other common elder problems. Common geriatric meds, lasix, xanax, klonipin, insulins, diabetes, blood pressure meds, percocet, zocor, dilantin, etc.
Just go slow and do your best. Do everything by the book, no short cuts. Don't gossip. Be on time, take notes, ask questions. Bring healthy food with you. Wear good shoes. Bring a stethoscope, bp cuff, pens and a sharpie. Know the policy and procedures of your facility, read the binders on your lunch time! Look professional, ie clean ironed clothes, hair back etc, just like in school.
Be polite to everyone, say hi to family members, answer call bells. Be enthusiastic. Be extra special nice to your aides, be respectful yet be a leader; without their support you are sunk. Good luck!