Always check the manufacturer's tag for any special laundry instructions, and follow these.
A clothes brush and hand steamer will be sufficient for many stains.
Never wash your jacket. Only have suits dry cleaned when absolutely necessary.
Suits can be pressed if they get wrinkled however a hand held clothes steamer and trouser press do a good enough job for day-to-day wear.
Always on a hanger, always upright in a closet.
Give your jacket plenty of air.