I forget the exact numbers, but they are known... but the ballpark is correct:
Only thing needed is an engine with constant acceleration of, say, a tolerable 1.1g. Aim the craft towards Alpha Centauri, and go. After about a year stop the engines. you’d be going 50% the speed of light. After 2 years, maneuver the craft around, light up the engine again, and start “braking”.
For someone on earth, time elapsed is about 7 or 8 years. For someone on board the craft, time elapsed is about 2-3 years.
There are online calculators where one can plug in various numbers for time, distance, speed, with constant acceleration in mind, to determine how long the traveler ages versus earthlings.