well after finally managing to get it into a garage for an mot it turns out she's dying

underneath this queen is completely corroded, I mean so bad that if i start trying to fix parts more problems are going to appear,
but to get her through an mot I only need to replace springs and brakes, the advisory list however is 2 pages long.....
so I guess my main question is how should I go about it, iv noticed some parts are hard to come by, fuel lines, brake lines, hand brake cable,
do I just strip her down and make it a full blown project (my mrs also informed me shes pregnant)

or do I replace the parts to get her on the road and then take it a step at a time, if so were in the bloody hell do I go to get parts for her!!