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Hi, I'm a first-time turtle owner and I want to be able to take good care of my 2 RES. As of right now, they are still babies but they are growing fast. Do you guys have any recommendations on what I should buy for their tank and when to size it up?

Usually, it's best to go as big as soon as you can. It will reduce the frequency of minor upgrades. Also to consider is that you will find out their genders soon enough. Male/male or male/female turtle setups don't usually work out. if both turn out to be female, it is no guarantee there will be peace in the tank.