First Project

Hey guy's I'm Tremayne and I'm 21, just bought my first project car, a 1975 Mk1 Escort 4 door with the 1300cc hi comp x/flow. I am a bit obsessed with historic rally, GT and touring cars and want to be a competitor in some form of motorsport in the near-ish future.
Here's what I bought:

It's all original and has surface rust here and there, worst rust I have found is the corner of the radiator surround panel on the battery side and the lip which runs along the bottom of the heater bubble thing, it's sort of split open along the join. I'm sure there's more elsewhere but I'm yet to find it.
Car was last serviced in 2006 at 131,000k's which is the same year that the rego ran out according to the rego sticker i found under the dash. The odometer now reads 132,600 so I think it may be possible that those are genuine K's which would be a good thing!
Anywho first thoughts are a gravel rally car at a club level, that's been my dream for the past 3 or 4 years, also interested in hillclimb and khana-cross type things and also like the look of the circuit racing which IPRA do so I have to pick one.
Problem is I have absolutely no clue where to begin with building the car, I'm guessing I should start with the rust, got my eye on a mig/tig/arc welder combo which needs a 15A plug so i want to get a sparky to run a dedicated circuit in to my shed and a plug in the meter box as I only have a car port to work on the car and that's where the meter box is. Then I have to learn how to weld. There's so much I want to learn, the more I can do myself the happier I will be.
Anyway, any suggestions on how I could get started would be appreciated.
P.S Am I supposed to use the leaded fuel additive?
Cheers
Here's what I bought:

It's all original and has surface rust here and there, worst rust I have found is the corner of the radiator surround panel on the battery side and the lip which runs along the bottom of the heater bubble thing, it's sort of split open along the join. I'm sure there's more elsewhere but I'm yet to find it.
Car was last serviced in 2006 at 131,000k's which is the same year that the rego ran out according to the rego sticker i found under the dash. The odometer now reads 132,600 so I think it may be possible that those are genuine K's which would be a good thing!
Anywho first thoughts are a gravel rally car at a club level, that's been my dream for the past 3 or 4 years, also interested in hillclimb and khana-cross type things and also like the look of the circuit racing which IPRA do so I have to pick one.
Problem is I have absolutely no clue where to begin with building the car, I'm guessing I should start with the rust, got my eye on a mig/tig/arc welder combo which needs a 15A plug so i want to get a sparky to run a dedicated circuit in to my shed and a plug in the meter box as I only have a car port to work on the car and that's where the meter box is. Then I have to learn how to weld. There's so much I want to learn, the more I can do myself the happier I will be.
Anyway, any suggestions on how I could get started would be appreciated.
P.S Am I supposed to use the leaded fuel additive?

Cheers