Lifting your own body weight is great and this is coming from someone who loves lifting weights. If youc an't do pushups start by doing them against a counter or wall or table. The higher position makes the pushup easier while still working your body, remember to support with your abs in the movement. The lower your angel (table vs counter) the harder the movement will be.
Cardio can be anything that gets your muscles fired and your heart pumping. Running is hard on the joints and unless you are very fit it is easy to get tired and discouraged. I jog sometimes outside or on the treadmill and my knees are okay with jogging but they protest running. Walking/jogging in place in front of the TV (or any where), if you put yourself into it and get your heart rate up is a great free exercise. Jogging in place for a couple minutes then getting on the floor and doing crunches then getting up for more jogging (rinse and repeat) is a quick exercise you can do for 10 minutes or so.
How to tell if something is cardio: Your heart beats will increase as the blood pumps faster to your hard working muscles, your breath will increase to fill the blood going to those muscles with oxygen. Engaging the large muscle groups is what will bring your cardiovascular systems to that level.
Make sure you are eating for muscle gain! Your muscles need good lean proteins for fuel to repair themselves after you work them, that is how they get bigger and stronger. How many reps do you do? Are you going for just bulk and trying to raise your one rep max or are you training for gains in strength and size (8-10reps)? I recommend going for strength and not just "visual mass" but I'm curious. If you're not eating enough calories or not enough protein your body won't be able to create the kind of gains it could with good food. This doesn't mean eat more calories than you need but it means eating smart.
A bunch of food/calorie type calculators on global fitness. Remember calculators are only guides - they have no idea who you are or what you need the just kinda guesstimate.
about.com is a great resource for learning about fitness and the like.
Other than that if you back post you should find some helpful stuff on food and exercise and stuff.
Remember to stay hydrated! Water water water water. You can't do anything without it.
And welcome!
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