B. albopilosum are excellent first tarantulas, I started with one (I have 4 of them now, will be 53 if counting my other tarantulas). One important thing to mention is that there are two variants, which are Nicaraguan and Honduran, also referred to as the hobby form. The Nicaraguan form looks better in my opinion.
B. albopilosum will definitely dig especially as slings. They are more medium growing than slow. Overflowing the water dish periodically will not hurt. It is unnecessary to chase humidity, as the term "humidity" is irrelevant to tarantulas. The moisture in the substrate (or water dish for drier species) is more important than the humidity in the air.
For slings the frequency of feeding is good, although I try to limit it to twice a week. As juvies 1-2 times a week is good, subadults and adults once, maybe twice every other week. B. albopilosum happen to be excellent eaters.
When buying a tarantula, I highly advise buying from a reputable seller online. If you want some ideas, drop me a PM and I'll point you in the direction of some sellers with good reviews.