If you have any serious gaps in your gear you can buy 115 gear from a few vendors in foundation. And you'll slowly gear up through dungeons as you continue to level. Beyond that, you shouldn't really worry about gear until you hit level cap. If you are able to cap before Stormblood and have time to gear up at 60 you'll want to look for something that's ilvl 260 or better. And then prioritize crit over skill speed over determination.

But really, you've got time to go through and learn bard and enjoy content. So I wouldn't be in a rush to really have the best possible bow. The only time that's really necessary is when you're running endgame 8 man content.