Roll 5d6 for your stats, keeping the best 3. Reroll if the sum < 10. You can take one stat at 18 and one at 10 and then roll the remaining 4.
I don't like giving players negs unless it's for roleplaying purposes. E.g. if you're playing a big dumb half-orc barbarian, you should probably have an intelligence score of 6 to 8.
