I’m in the UK.
I think you’re making a sensible step, it’s worth a go for sure.
There’s a user on here called @JDEE0 imo he’s the most knowledgable and unbiased when it comes to finasteride, it’s worth going through his posts on the subject, no hysteria just backed up research.
You could try going to your GP and get a prescription but it’d be easier to get it from a website like Dr Fox (google it)
I get the generic type in a 6 month supply, you could try a month supply to start of with, it’s relatively cheap. They’re 1mg a tablet, so just take one a day, no cutting etc.
I’m not a medical professional but id suggest starting by taking it Monday Wednesday Friday, if after a couple of weeks there’s no bad sides, go up to 1 a day. Take consistent photos (same lighting/camera etc) every month and track your progress on it.
I’m rooting for you man, we all empathise how rubbish you can feel when losing hair.