Trying to start a new career

I left the Army 3 months ago and retrained in IT. I passed my A+, Net+, MCSE W2K and my CCNA all in 8 weeks. It was hard work but I thought it would be worth it. The only thing is I dont have much real experience. I have applied for over 100 jobs across the UK but haven’t even had an interview as yet. How do I get experience? How can I get an interview? How can I show an employer that I can do the job?

Any advice for someone trying to start a new career?