I have all 3 Metro games but was thinking of playing this one *gold edition* first?

I'd just appreciate some advice....

In-game chronological order:
[url=https://en.wikipedia.org/wiki/Metro_(franchise)#Video_games]https://en.wikipedia.org/wiki/Metro_(franchise)#Video_games[/url]
https://steamcommunity.com/app/286690/discussions/0/1628538707062179129/

If you don't care about plot, you can play however you want.

Thanks, I'll start with the first then...