Framing and Sub-Flooring - foot went through old floor !~

Last year my wife and i had a "small" termite problem, so we called terminex and had that taken care off i ripped the damaged parts out of the floor.
The Tongue and groove plank's and also cut out the best i could with my knowledge..to joices soft spots then ran some boards against them paralel to give them strentgh,

Now we have a new problem some dry rot, There isnt alot of moisture under our house and we have good ventilation "Now" ( at one point my wifes dad bricked it all in, and cause us some problems.

but what i would like to do, is tear out all the 75 yr old tongue and groove and replace it with some 3/4 plywood, But our house isnt level so the floors would have lean's to them, Mind you its not a 5" lean but maybe 1/2 inch in 8 ft, i went under the house and the joice's and support beams seem very solid to me, How can i lay a floor in a crooked house and make it level?

Any tips would be appreciated, my wife and I are newly weds and I just want to save us some of our hard earned money. So i thought with new wife comes the new chores.. Home Maintnence.

Thanks in advance.
Glenn

Well congrats to you and your new bride and welcome to the forums. Ideally you would want to get under the house and jack up the low spots, then block it up with new piers, concrete blocks, or timbers. Other options would be to sister in some new joists bringing them up to level as you do so or else you can add shims on top of the sunken joists to level things out. Keep in mind you will need to take doorways & such into account, you don't want to shim a floor level only to learn that a door won't close over the newly leveled floor. Which is why to do this properly you really need to get under the floor and jack things up from the bottom. HTH