Disclaimer, I dislike spiders, they are too quiet and creepy and make my skin crawl.
Mom spider produces a lot of babies each time. If her eggs hatch inside, you will have lots of spiders, usually too small to notice initially but they grow quickly. Insecticide is your friend. Spray on top of cupboards, in cupboards, closets behind bookcases behind and under appliances etc.
Technically all spiders bite and all spiders are considered venomous. However, the venom produced by many spiders is not toxic to humans and the mouth parts of many spiders are not big enough or effective in piercing human skin. Except for spiders that are a big risk, the effects of a spider bite are similar to the equivalent of a 1 lb mosquito. Redness, itchiness, possibly some localized pain that Tylenol easily manages.
For most spider bites the most significant risk is infection. Like all creatures that don't brush their teeth, spider mouths are filthy and a staph infection is very common. When you receive a bite from a spider or anything else you may not have seen do its thing, it's a good idea to wash the area with clean water and lots of soap. Some iodine applied locally if you have it.
Draw a circle around the circumference of the area of red skin with the bite in the centre. Every hour to 90 minutes check to see if the redness has spread beyond your drawn circle. If it has, draw a bigger circle. If you have three instances (3 - 5 hours) of the redness spreading, its a good idea to see a doctor to get a recommendation for an effective antibiotic.
If you are bitten by a spider or other creepy crawly that is toxic to humans, you are going to know a whole lot faster than above. Bigger spiders are not necessarily more poisonous than smaller spiders and not all toxic spider bites inject toxin. Spiders like snakes are capable of dry-biting without releasing poison. The smaller the person usually the more pronounced and the quicker the symptoms present themselves. Suffice it to say you'll have no doubt within a maximum of 90 minutes that you need medical help.
If possible catch the spider to show the doctor - it doesn't need to be alive, just not smashed into a collection of unrecognizable parts and goo.
In this country, you are within 3 or 4 feet of some type of spider most of the time. Most will leave you alone unless you roll on them in bed, sit on or near them, touch them when picking up outdoor furniture and most of common, if you slip your foot into a not often worn shoe that has become a spider's home.
I will relocate tarantulas if they allow themselves to be captured easily, I tend to kill everything else. I don't need or want more spiders than I already have and routinely fog the patios, the outdoor furniture and the roof overhangs.