Suggestions on making a blog

I’ve been toying with the idea of making a blog. Frankly there are certain things which annoy me so much, some common seeming attitudes I’d like to question and simply so many times I feel ‘I want to at least try to do something – even if it’s just to say this is wrong’. Anyway I know we have some great and experienced bloggers on here and I’d really like some advice..

A/ Is a blog a good idea for this?
B/ Can I set up a blog for this purpose for free?
C/ Where is best for me to start/ which site or such should I look into?
D/ Any other advice?

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