There are many different ways that people will roll their stats. Some prefer the point buy method described in the Players Handbook. Others would rather take a pre-determined set. Still others will always roll their stats for that slim chance of getting better then average abilities.
Please follow these steps.
Step 1.) For each stat, plus one extra, you will roll four d6's. Adding together the three highest dice and discarding the lowest. This will give you seven, hopefully decent stats.
Step 2.) Discard the lowest number of that set. So if you end up with: 16, 14, 10, 13, 18, 8, and a 12, you will discard the 8 and use the other six. This gives you your first 'set'.
Step 3.) Repeat Steps 1 and 2, twice more.
Step 4.) You should now have three different 'sets' of stats. Pick whichever one you want to use and discard the other two.
Step 5.) You can move points from ONE stat to ONE other stat. You can NOT exceed 18 in one stat. For example; if I took that set I used before then I would take 2 points out of the 13 and add them to the 16 to create an 11 and an 18.
Step 6.) Apply each stat to whichever ability you wish.
Step 7.) Apply racial modifiers.
This should give everyone a more then fair chance of getting better then average stats. If you have any questions, please send me a PM and I will help you.
Happy rolling!