Runners of Ireland... How did you get started?

I'll try keep it short and sweet. I'm a big lad looking to lose weight, currently starting a calorie deficit (again, lost a good bit of weight during covid) and looking to do couch to 5k, as well.

A question I have is, what do I need? Do I need to buy proper running shoes, trousers etc, or will trainers and sweatpants do for starting off? Is there anything in particular I should do/avoid?

Thanks!