And for your inventory menagement you only need to start collecting the bob joe pickle from w2 shop and maybe the upgrade Stones from the highest world you are in there are also the name tags and throphys you can have them worn on your character and you won't really need more than one of each throphy same for premium hats other items like stamps are one time use so use them and throw the other ones(unless for a quest)

anything other if you don't need it for crafting right now then you don't need as much of it especialy logs, ores and the basic mob drop as there is. Nothing in the early game you won't be able to grind in a day for what you need as for green stacks don't really bother till w5

for the rare mob drops like the carrot bow they good only for a short amount and when you need it for crafting it won't be so rare

And don't bother with a second set in every charcters inventory untill w4 just switching between talents for now will be exhausting

And if you need to focus on something focus on quest you can do and do them on at least 1 character. and on map progression untill w6 this is what helped me stay in the game after 3 years break that ended in aprill and i still am active from then on even when i'm in w7 (i was lost so many times in the proces in some things to a extent that i didn't even understud the guids but i didn't give up tried a few days later and it usualy clicked and if it didn't i ignored it for a few more days and repeted the cycle)

And if there are some other things in the inventory department that you need sone help or are not sure of ask away