Is there a formula to following or pattern. This is very new to me and I am having issues with these type of problems, please help

You need to look at the differences between each number. At some point a pattern will repeat, and you follow the differences to determine the next number in a sequence. Do you have an example you can post?

Example: 2,5,6,8,11,12
The difference between 2 & 5 is 3
The difference between 5 & 6 is 1
The difference between 6 & 8 is 2
The difference between 8 & 11 is 3
The difference between 11 & 12 is 1,

So the pattern in my example is already starting to repeat. so the pattern is add 3, add 1, add 2, then it repeats, 3, 1, 2 etc. So the next # in the sequence would be 14.

Hope that helps.