On front wheel drive cars (FWD), I found changing tyres side to side at about service intervals worked best.
As Rolebama points out changing two tyres is less of a financial shock.
On FWD tyre manufacturers recommend new tyres go on the back, obviously the part worn rears go up to the front, this gives the new tyre a chance to, 'run in', new tyres need to dry out.
Oil changes, it is important on modern engines to use oil of the same technical spec as recommended by the manufacturers and change the filter.
As the engine gets older, it tends to get more dirt into the oil, so it is worth changing the oil filter between services.
Depending on the orientation of the filter, it is kinder to the engine to pre-wet the filter or fill it with oil (depending on orientation) before fitting, with a smear of oil on the rubber sealing washer the filter can be tightened by hand.
Always start spark plugs at least a couple of turns by hand to be sure they are not cross threaded, 'cause it takes a long time and effort to put it right.
Anti freeze lasts about three years, so change every three years.
Brake fluid, is best changed as recommended, it is hydroscopic (it absorbs water) this can turn into steam which doe's not work in a hydraulic system.
Rust stains at pivot points is an indicator of trouble - investigate.
Oil level, coolant level, and tyre pressure are worth checking weekly, if not, certainly monthly, all are best checked cold, it is better to use your own tyre gauge. Check the spare.
Whist checking tyre pressure, a quick look at wear patterns will indicate what is going on.
Wear at one side of tread - alignment problem (a few makes of cars do normally wear tyres unevenly).
Wear on both edges - tyre running underinflated.
Wear in centre of tread - over inflated.
For long journeys fully laden, it is worth inflating to loaded pressures in the handbook (or look up on internet) but remember to deflate when back home.
A smeary wind screen, if dry can be cleaned with white spirit. (don't forget the wiper blades)
If there is damp around then use methylated spirit.
I never found a windscreen washing solution that would cope with road grime.
Squeaky bushes respond to PTFE spray or WD40, WD40 will refresh plastic bumpers.
Avoid, oil or WD40 in locks, (anything wet attracts and holds dust) the best is graphite powder second PTFE spray.
Trying to apply polish in strong sun is hard work and frustrating so if you must, do it on a cool car avoiding the sun.
Some polishes work easier on a damp cloth (it will say on the tin)
Car shampoos usually contain rust inhibitors, washing-up liquid doe's not so don't use it.