I know it's hard to to come to terms with the fact that a BP's really prefer to be completely hidden away and not seen (at least it was for me), but it is the truth. That's not to say there aren't some BPs who are less fearful and more curious and typically as they get older they are more okay with being "on display." The problem with a baby BP is that they are usually extremely easy to stress out and it's often from feeling too exposed or having improper temps, humidity and hiding spots. The best solution to this is a tub. Other methods can work, but I'd really recommend using the tub for the first 3-6 months of having your new BP. This will help get them eating regularly and you'll see that they grow rather quickly this way. The other key for this to work is to not handle them too much. Even my adult BPs don't get handled more than once a day and usually more like a couple times a week. A baby BP should be handled for short periods of time only (like under 10 minutes) and ideally not even daily.
As for what to return, I'd go with everything if possible. As said, overhead lamps tend to kill humidity and make it difficult to control the ambient temperature without a good thermostat (usually on is too hot and off is too cold). If your room temp is stable and you can keep it above 70 degrees, just having a UTH and a thermostat set around 90 degrees on the hotspot will suffice. If you stick with the glass tank, use a substrate that will hold humidity such as Eco-earth, Reptichips, Cypress mulch etc.
Remember, your snake is going to live a long time, so I'd recommend saving your money to buy a nice enclosure that will work for their entire life rather than spending a bunch on a small tank they will grow out of. To give you an idea of cost, my setup is as follows:
Animal Plastics T8 enclosure with divider - $220 (there are many other makers of PVC cages out there as well).
Reptile Basics 40 watt Radiant Heat Panel (I have two - one for each side of the cage) - $70
Herpstat 2 Proportional Thermostat - $200 (a Herpstat 1 will do depending on your setup, is $140)
Accurite Thermometer/Hygrometers - $20 (again, two for mine)
Reptile Basics Hides - $5 each
Water dishes - $5 each
I know, expensive. It can be done for less, certainly, but buying a home that can house your BP for the next 20 years will pay off in the long run. PVC enclosures are also much better at holding in humidity and temp, making them less work in general.
Here's a pic of my setup (an old pic from when I got my second BP and yes, that's a make-shift hide on the right side):
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