Reroll your stats a couple of times you can save your best score and keep rolling till you gaet a better one.
The method I use is:-
If you rolled 18 11 13 14 10 9 using your mouse on the up down button change this to 14 14 14 14 14 5 then save it and roll again all you need to do to see if you have better stats is the same again but hope you have more in your last column i.e 14 14 14 14 14 8 is a better roll.
Also if you chose a thief I would spend more on hide in shadows and find traps than anything else as these could stop you dying a horrible death.
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At an early age, Mordrick the Monk showed Promise!