Cag
A very warm welcome to Leo (I am sure you are not lazy
) and to Happilyahousewife
Happily sounds like my kind of household!! 
Leo yes, I second what Furble says, don't get overwhelmed. The over-riding principle of the Flylady system is that you do short, sharp intense bursts of chores but do them very regularly and consistently. So, for example, don't spent hrs cleaning your car out until it is finished. Just spend 15 mins every Fri until it is clear. It will make a difference, I promise, you just have to keep at it regularly, week by week. (Remember, car de-cluttering will come up next Fri, and the Fri after that too.) That way you won't get burnt out.
I totally 'get' your confusion over the zones because I have a large house too ( a wreck, old, bits falling down, holes in walls etc) so you have to adapt the system to suit yourself and your home. Basically, I just focus on the main 'public' areas and the rest (which we don't use much) has gone to wrack and ruin but it is better than it was having extracted the main principles of the system, and got them to work to suit things here.
I also have a list of things to do twice monthly, quarterly, bi-annually and annually in my control journal (which will come up in a bit) which I ignore do from time to time.
Here is advice from Flylady herself in which she says "Don’t forget, all I ask is 15 minutes a day. Set a timer and just do a little every day. You will see a difference in a week’s time. In a month, you will start to notice a trend in your home. You can do this. It didn’t get dirty in a day and it is not going to get clean overnight. It is going to take a few months of decluttering, and then detail cleaning, to make your home the place of peace you want".
Also, was it FromWesttoEast who was asking how how to fit in the home bleugh down thread? (Apol if I have this wrong.) Have just noticed that Flylady also says "Many of you are trying to do zone cleaning while you are doing your Weekly Home Blessing Hour. Don’t do this. In fact, it is more important that you concentrate on your morning and before bed routines before you do your Weekly Home Blessing Hour."
Having revisited it just now, the website hasn't improved in terms of clarity has it? 
HTH!