This is using 5th Edition rules, but any recent ones will do really.
STR, DEX, CON, APP, POW: roll 4 d6, pick the best 3.
SIZ, INT: roll 3 d6, pick the best 2 and add 6.
EDU: roll 4 d6, pick the best 3 and add 3.
KNOW = 5 * EDU, IDEA = 5 * INT, LUCK = 5 * POW.
99 - Cthulhu Mythos = 100 - d3. (Cthulhu Mythos = d3 - 1.)
Damage bonus = +d4 if STR + SIZ >=25, +d6 if >=33, -d4 if <=16
Hit points = average of SIZ and CON rounded up, Magic points = POW.
20 * EDU points to divide between occupational skills, 10 * INT to divide between hobbies and interests.
Starting sanity = 5 * POW.
That's probably enough to be getting on with!