First off welcome to the site, second thanks for rescuing an animal in need. For BP's their needs are fairly simple you need heat, shelter, food, water, and places to hide. For now I would suggest on making sure your husbandry (temps. humidity, etc) are all correct. The biggest mistake people make is not providing a regulated heat source. This can be in the form of a heat lamp though it's tricky to set up in a plastic tub., or a heating pad called an under tank heater (UTH). The single most important thing is to make sure the heat is regulated by some kind of thermostat to keep the hot spot around 90 degrees. Do not use a heat rock they get too hot and are notorious for going bad in the on position and seriously burning your snake. My suggestion is to take it slowly and get a tub or tank properly set up with a UTH on a thermostat connected to it before worrying about live plants vs fake.
BTW: this is being provided on very little info about what you do have currently so providing more details on everything you have will make answers more accurate.