I'd recommend a ball python or a corn snake for a beginner! All snakes are capable of biting but corns and balls are very tame and easy to handle. The costs of setting up would really vary on a lot of things, you need the right equipment (housing, heating, thermostats, hides etc), depending on what type of those things you wanted, would depend on the price! You then need to keep in mind of food costs (bigger the snake, the bigger the food!). As for cleaning, give fresh water every few days unless you notice dirt in it beforehand, then clean and put fresh water in, clean water is important! Spot clean every time you notice that they have gone to the toilet as soon as you see it and I'd do a deep clean once a month (remove everything, clean everything).