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1. Cooling pads are a worthless if the laptop has side vents. Try to keep the vents free from any obstruction in the air flow. If the vents are in the bottom, keep the laptop on a flat surface.
2. Antiviruses: don't buy Quickheal, NPAV. Use 360 Total security, Avast, Avira (free) or Eset, Kaspersky (paid). IMO free ones will do the job without being a resource hog.
3. Battery: Always use the laptop on AC power, and on batteries if AC power isn't available. Don't play games on battery. This will prolong battery life.
4. Don't buy el cheapo (or local ones) peripherals for the laptop i.e Mice, keyboards, gaming pads, etc. They'll be a waste of money and may even damage the USB ports. Try to save money and buy better ones later.
5. Good laptop bag preferably a waterproof one, though would cost more but will be better to carry your laptop safely.
6. The way the screen is opened or kept tilted could effect the strength of the hinges. Don't keep the screen at awkward positions to avoid damage to the hinges.