Well the thing with modes is the next. Your normal everyday average major scale is the first mode Ionian, and each subsequent mode is just the same scale just that you start at the next note of the scale. So:
Let's use the C major scale as an example for simplicity:
Your First mode (Ionian).... and the scale would go as follows:
C-D-E-F-G-A-B-C
Then your next mode will use the EXACT SAME NOTES. The difference is that you'll position yourself so that the first note of the scale is the next note... in this case D.
So, your second Mode (Dorian) would go as this:
D-E-F-G-A-B-C-D
And you continue the process to identify every subsequent mode with the third, fourth, fifth, sixth, and seventh note of of our first major scale.
So... what's the difference? aren't those the same notes? Shouldn't it sound the same?... Technically yes, but when you position yourself playing on a chord progression with a mode you'll see that you have a very specific character for each mode.
If you play a Dorian scale over a certain chord progression you'll get a certain feel, and if you suddenly change to Aeolian Mode the tone will change drastically.
Each and every mode is subject of study. You can find some great youtube videos about each mode and how to use them.
Check out this video:
https://www.youtube.com/watch?v=ljD8y0TotrwIt explains the Dorian Mode in detail, then you can dig around as you please to satisfy your hunger for knowledge.