Do not forget YouTube. Looking at somebody doing the work can explain much more about what to do and how to do it than reading about it, especially for a beginner.

What I do when I learn something new from YouTube is I look at several films on the topic and then pick the one that explain it in a way that I like and then look at that one again- sometimes several times.

I suggest that you start with all new spokes for the wheel and keep the old ones as spares for the future.

I also think that unless you are one of thos peopel who are a "born tinkerer" I suggest that the first wheel you build or repair is not a whheel that you need to rely on but a spare wheel or a wheel from a bike that you do not use dayly.