Hello, i just recently got into youtube.
I need a FREE program that i can use to edit pictures and videos into a video, and add effects, that i can upload onto youtube. It must have good quality, and i want to be able to add my OWN music to it aswell, because i often make music videos. I also want the ability to change the duration of the pictures, so its faster, and i can fit more into less, if that makes sense.

Please share some links that i can try out, and as i said, must be free, or im not interested. It also must be safe and not cause any viruses/problums to my computer. Thankyou!!!