Starting to collect again, at 34

Hey people, I haven't bought pokemon cards since I was a kid and was wondering where to start?

I love pokemon but haven't followed it or purchased any cards in like 20 odd years.

More interested in the OG 151 mons of any art type.

What products would be best to start with and what sites etc should I use/avoid. Electric, psychic and dark are my preferred types.

Thanks in advance :)

EDIT : I'm based in Scotland, UK.