My train varies along the time of the year, right now I'm working (only for 2 months so, it's ok if I don't do much exercise meanwhile) I have less time, but the usual was exercise every 2 days and in the gym was 2 different bicycles, and cross, then I would do sit-ups and push ups.
The bicycles and cross were mainly to keep the body fat free, but the sit-ups and the push ups actually toned the body.
I used to do separated sit ups (superior, lateral, medium, lower, and then complete ones) and between each set of sit ups I would do push ups.
Would total around 300 sit ups and 100 push ups on my best, with 45 minutes of cardiovascular.
If you follow that training for 2 weeks, you'll notice the difference.
The food... I eat a lot of junk and doesn't really matter, that practice it's beast!
I also lift some one-handed weights to train my biceps when I don't go to the gym, since push ups don't. Currently I was lifting 16Kg if I'm not mistaken (started off 2 Kg xD)
On weight lifting I advice to start off with a low weight (really low) but to do around 35-50 lifts up in a row, and keep on that until you can do it 2 times, then you can start moving on to the one with more weight, that way you won't simply have huge biceps, but defined ones with lots of strength and resistance.