Hey Pareeeee (I have to count the "e"s every time, ha ha),
You'll probably find answers to your questions littered throughout the forum (beckdg has been doing great work lately in compiling some great starter threads), and I'm not a reptile expert by any means, but a quick search indicated that 60% humidity during the day seems fine. This could easily be accomplished by the method you're intending to use.
Mold can come from a variety of things, but cool, damp, stagnant conditions are what it likes best. Your tank will be warmer, but you may want to have a look at options for air movement in your viv if you think it'll be an issue.
If you're diligent in your watering, you may be able to achieve the required humidity with a screen door, but I believe most people use glass and then create a section of screen above that if necessary.
Again, though, have a look around here and elsewhere- you'll get differing opinions from mine, no doubt, and you'll have to just experiment and find what's right for you.
Cheers,
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