They don't climb so the vines would be for your enjoyment more than theirs. The Eco Earth is a big no. Go with a small or medium water bowl rather than a large, and I personally don't bother with a food bowl since they only eat live food and it won't stay in a dish for more than a few seconds.
I use these for UVB:
https://www.chewy.com/zoo-med-reptisun- ... ation-Size
Zoomed sells a matching fixture. The T5HO is better but costs two to three times more and honestly you probably don't need anything that heavy duty.
MBD causes weakness, lack of coordination and ability to aim when feeding, loss of appetite and then weight loss. In later stages their legs start bowing and sheds get stuck on feet, then bones start breaking all over. I'll attach pictures of my really bad guys. They walk on their elbows because their legs have multiple breaks and their feet have been crushed from layers of stuck shed. The Kid's ribcage has actually collapsed because his bones turned to rubber. They are all vet checked and they aren't thought to be in pain now that they have recovered and had calcium to replenish their bones, but there is no way to fix the breaks so the injuries are permanent. All of it can be 100% prevented with dusting with calcium at every feeding and using UVB lighting for daytime species.
A private breeder with good reviews is the best bet for getting a healthy animal. Most shops sell babies and there are many that are calcium deficient or that carry a deadly untreatable parasite. If you have a reputable reptile rescue around they will almost always have leos that need homes. You can always find people rehoming online as well thought that is always a roulette on health. I got all my MBD rescues that way, and I do not regret it, they are awesome little dudea.
I am personally hands off with my leos. I have nerve damage and I worry too much about dropping them or knocking their tails off. Plus, babies scream and bite! Heck, my adults bite if I try to get them to move out of the way. Not my thing, we're all happier with them being untouched.
All of mine were rescues in rough shape so I did not wait to start feeding or force feeding. I honestly don't know how long a healthy one should settle in for, I imagine a few days if it is like most reptiles, but they all go at their own paces.
This is the closest thing to dirt I would recommend:
https://zoomed.com/excavator-clay-burrowing-substrate/
The heater may be a little big. It's recommended to only have a third of the tank heated, so they can regulate their temperature so they don't overheat or get too cold. I only go as big as 11x11. Most of mine for the leos are 11x6 or 8x6.
You may need a light to help with temps. The UTH by itself is probably not going to warm the other side up to 80 like is needed. You'll have to set it up and see what it does. I really do recommend a thermostat so there are no burned bellies! UTHs can get too hot, and I have seen many many tanks set up where the leo is overheating due to heat lights, which is why a thermostat is so important. There is no easy answer on what is going to work for you, just trial and error.
New critters are always exciting. 
Think you could share some pictures once you get your gecko? 
I'm not big on lizards, or anything that looks like one (we had a blue-tailed lizard in our house once. Our dog tracked it down and alerted us, sweet thing), but I've always liked geckos. They're so interesting. 
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