ok you will need a 14mm socket wrench or box wrench, lift the car and remove the drain plug on the oil pan and let the oil drain into a bucket/catch pan, once most or all the oil is out put the plug back in (be sure to check the little gasket around the plug first if it is falling appart you should replace it by the next change) then tighten it down till its tight dont over or under tighten it but tighter than hand tight, then reach under the manifold and try to twist off the filter, it should come right off but if it doesnt its a good idea to invest in a oil filter wrench or strap wrench and then thread down the new one, if it is a 4afe it takes about 3.7 qts oil 7afe's take about 4qts i suggest that you use 10-w40 you can use anything from crap mineral oil to fully sinthetic just depends on how much you want to spend,
after you add the oil run the car for about 30sec check for leaks then check the dipstick by pulling it wiping it then stick it back in and pull it if the dipstick oil level is between L and F then you are good if it is above F you put too much in and will have to drain a little, if it is barely on the dipstick then add about a .5 qts and check it again
i would change the oil every 3k-5k depending on how you drive and how much and be sure to get the car up to running heat for at least 15min every week (if not every day)
learning how to change your own oil is a great start to loving your car more and knowing more about it