Visual Effects Help!?

Hello! I'm Gage and I'm a young filmmaker working on a short film right now titled "The Day After The End". It's a horror/action film. I'm having some trouble though with the visual effects that are in the film. I've edited before, but I've never done an explosion. I have this scene where one of the main characters is running from a barn she was in. She planted a timed bomb and as she runs from the barn it explodes in the distance.

Can anyone show me how to make it explode, or is there anyone interested in actually editing this scene for me! You'd get complete credit for your work when the film is finished!

Thanks so much!