>I would like to know the way to proceed in the first lecture of Deligne's Le groupe fondamental de la droite projective moins trois points. 
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>General advices for reading Deligne's paper.
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>What should I know before reading Deligne's paper?
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>What should I have in mind while reading the paper?
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>Useful tools for reading the paper (for example Know what the yoga of motives is.)?
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>What are some references for algebraic geometry (if any) over tannakian categories (other than Deligne's Le groupe fondamental de la droite projective moins trois points).

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