Buy the best burr grinder you can. A hand-grinder can be a good low-cost choice.
Buy a scale. A digital pocket scale is fine. They are small and inexpensive and the simplest way to measure coffee accurately.
Heat your water any way you'd like, but let it rest for a bit after boiling. Shoot for around 200 degrees.
Use fresh coffee, it's more aromatic and it just taste better. Grind only what you're brewing. Store whole beans in a cool, dry place.