If you decide you want to continue then buy yourself a copy of Shadowbringers (the latest expansion) as it will include all of the expansions with it. There are a couple of caveats (you can’t participate in the market system or join guilds, or Free Companies), but this is the best way to start. Covering both the base game and the first expansion (Heavensward), it’s basically the equivalent of two massive JRPGs back to back.
If this is your first time playing and you’re a little unsure about investing in a monthly subscription, then you’re in luck: There’s an extremely generous free trial. FFXIV beginners guide : Everything you need to know
