You're probably ok, but spider bites are nothing to mess around with. If the bite becomes very painful, gets bigger, changes color, etc, you'd better get it checked by a doctor. Make sure to keep the bite clean (dabbing with rubbing alcohol helps) and put a band-aid on it so it doesn't get infected.
Yes, because even if the spider is small their are tendencies that it is venomous. So you should not disregard the probable effects that may occur. You should seek or ask some advice to person who knows about spiders or can give you ideas if it is venomous or not.