Whatever works :) You can roll, or you can use point buy. Either way, like Traveller, char-gen in Star Frontiers is pretty quick and easy, just like ol' Basic D&D.
If we go Spacer, there are a few minimum attributes to consider whilst building...but you get lots of skills to go with it. HOWEVER...anyone thinking about the Mentalist PSA (ie funky psychic powers) isn't likely to go to the Academy and thus will get stuck with something less well developed.
Naval Academy stuff (KHDR p 94-95)
All cadets entering the academy must have scores of at least 50 in six of their eight abilities. The character's Leadership score must be
higher than 50. No character who has been identified as having committed an illegal act will ever be admitted to the academy.
(...skip a bit...)
Cadets who successfully enter a skill area at the academy will graduate after two years with 1st level spaceship weaponry skill (either rocket or energy
weapons) and a 2nd level ability in the spaceship skill of their choice. If the character did not have the foundation skills necessary for a spaceship skill
when he entered the academy (such as 6th level computer skill for astrogation), he will receive these as well.
Junior Lieutenants may advance in rank by earning experience points. Experience points spent to in crease an officer's rank may not be used to increase that character's skill level; however, officers are required to increase one of their spaceship skills (or add a new spaceship skill) at least once after each promotion.
And from back on page 55 of the same PDF we get this little chart, showing what you need to get which Starship skills:
Spaceship Basic Skill
Skill Level Required
Piloting Technician 6, Computer 2
Astrogation Computer 6
Engineering Technician 4, Robotics 2
Rocket Weapons Projectile Weapons 4, Gyrojet Weapons 2
Energy Weapons Beam Weapons 6
In other words, the only way to start PCs as even novice spacer crew is to start them as Academy trained...
Which I think was probably an oversight in the original design. Keep in mind that regular (ie non-Academy trained naval officer types) starting characters get two skills at Level 1...