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Anyone able to help?

I've been persuaded to start weight training and, in order to do that, I need to start eating a lot more calories and especially a lot more protein.

Does anybody know how to work out:
a) how many calories I really need to eat
b) how much I should adjust my macro goals in favour of protein

I'm not bothered about losing weight, I want to change my body shape instead. But I have a very poor metabolism from years of eating disorders so I want to make sure I don't suddenly start piling weight *on*

I've had something called the metabolic diet recommended to me which only takes 3 days and is a reset, apparently?