Here’s a task list for your fall cleaning. This is a VERY comprehensive list. You may not need to do everything on it (and you may not have time to do everything). Also, you don’t need to do everything yourself. You can divide chores as a family or even hire out for some tasks. Many house-cleaning services are willing to come in and do a one-time deep clean. Now, they charge a bit more for that than they do for regularly-scheduled cleaning, so be prepared. Also, the earlier you can request an appointment, the better. They will save dates closest to the holidays and prime times for their regular clients. The sooner you contact them, the more choice you are likely to have.
In all rooms:
Living Room/Dining Room:
I know, this is a lot. I typically allow 1-2 hours per room to do everything. Since I live in a small house, I can finish up in a weekend. I treat myself with a long, hot bath and takeout for dinner.
You can also tackle it in stages. First, you clear things and put things away. possibly doing a little bit each day. Once everything is decluttered, you can start laundering and mopping and dusting in a larger bloc of time. It will amaze you how much faster cleaning goes when you aren’t mopping and dusting around extra stuff!