Its not always the first thing that comes to mind...but it is very helpful to take a picture first. When people on here can see the bugs it's much easier for them to help you id the bug and then let you know what to do about them.
Usually; when you have bugs in potting materials you repot. If the plants around it are infected you may have a very big job....pouring stuff through will help, but not get rid of the problem totally. Bugs are best controlled through prevention, once throughout the plant it can be difficult to completely get the bugs back under control and often the plant declines slowly allowing the bugs to move to other plants as well. When bringing new plants into your collection, set them away from the others until you know they are free of pests and disease. It will save you alot of money and time...
Good Luck