Ford focus mk1 central locking. UK?

I have an x reg mk1 focus, I've always had to use the key as the fob always locks the car then automatically unlocks again. My issue is now the drivers side door won't let me turn the key properly to lock the car manually and it only locks the passenger door if I lock it from the other side. The lock on the inside is completely seized up too. Feels as though it is jammed. Any help? Uk

Are Ford Focus's holding up?

Looking at a '01 wagon with 2.0 L 4 cylinder, automatic with about 86,000 miles. Curious as to how far I may be able to rack up the odometer before having troubles.

2007 Ford Focus cuts out when idling?

When I'm at a stop light or stopped and car is idling it cuts out pretty bad, also when I start my car it revs high then cuts out a little. When driving just now while turning it just died, check engine light on, says intake manifold stuck open? Any suggestions on what it could be?

I want to save up for stuff but haven't been taught?

I'm still job searching, but I'm getting there.

I want to both move out, and save for a car. I'm thinking of just a ford focus, nothing expensive and difficult.

My girlfriend wants to move too, and she's looking for a second job so moving isn't going to be impossible.

Out of a paycheck for full time minimum wage Canada Ontario, how much should I set aside for a car? I'm not sure how much to set aside each pay.

Also probably going to want to set money aside for a house, how much per pay should I set aside for that as well?

There's so much I want to do, and my parents and school have not taught me this.

I appreciate the help. Any tips would be great.