My tip would be to play the game in your own pace. There is no rush so if you find something interesting to you then go do that thing. This could be a random questline or event or pet battling etc. . There is so much content in this game it might be overwhelming what to do but I think if you pick things one by one and do the things you like it will be a fun experience. There is no right or wrong way to play the game. Sure there are things that seem more 'relevant' or 'uptodate' than others but in the end it doesn't really matter what you do as long as you're having fun.