I'm knew to Call of Duty Ghosts. How do you get a knife or bombs or radar?? The manual doesn't tell you any of this

I'm knew to Call of Duty Ghosts. The manual doesn't explain everything you need to know. How do you get or use a knife. I'm playing on my PC. How do you get bombs, radar, dogs, wolfs. And how do you use these items and make them active. If anyone could help me out that would be great.  Thanks