Do you have a microwave at work? That will open up your possibilities quite a bit.
Cooking really isn't that hard. You just need to dive in head first and figure it out as you go. Yeah you'll get a list of ingredients and instructions for cooking stuff with any recipe, but IMO it's the "mechanics" of cooking that you need to learn. The intricacies of cooking things on the stove top, making sure they don't burn, how much oil to use, little tweaks you can make, etc. And those just come with experience, so get started!
Here are some of my fav things I like to make that are all pretty quick and easy:
Chicken quesadillas: buy bulk boneless chicken breasts from your local Costco/Sam's Club, chop them up into small pieces (I find nice heavy duty kitchen scissors make this pretty fast), and cook them in a saute pan/skillet with olive oil and your choice of peppers or other goodies (I use bags of mixed frozen peppers). Add some pepper or other spices to the chicken while cooking if you like. Once the chicken is cooked thoroughly, drain the juices as well as you can, and prepare your tortilla shells. Get the big tortillas and put a layer of cheese down over half of it (you're going to fold it over, or you can make a giant sandwich out of it and put another tortilla on top - either way). Spoon some of your chicken onto the cheese, covering the area of the tortilla of course, and then cover the chicken with another layer of cheese. Fold the tortilla over and repeat with the remainder of your chicken on additional tortillas. Bake for a few minutes until the cheese is melted and voila. The ones I make are packed with chicken and quite hearty.
Chicken pot pie: chop and cook chicken as described above, drain juices. Pour a small can of cream of chicken soup (I think 8-10oz?) into a bowl and add 1/2 can water, 1/2 can heavy cream, cooked chicken, and your choice of vegetables. I use bags of frozen mixed vegetables, again bought in bulk. Take a pie baking dish and spray it with non-stick spray. Put a single pie crust (usually 9") in the bottom, pour your chicken/veggie/creamy mix in, then place another pie crust on top, of course pinching it the edges of the two crusts closed. I suggest baking at 350 for 45-60 minutes, but you can do more temperature at less time. This makes a LOT of food and is GREAT heated up for lunch.
There are lots of chicken recipes that are simple and great re-heated. Plus chicken is a good source of protein and is relatively lean. You can make a chicken stir-fry, baked chicken, chicken noodle soup, etc.
I like
http://allrecipes.com for a variety of recipes. I got started cooking with a recipe from there for Vodka pasta sauce. I ended up adapting it a little to my preferences and it is KICK ASS. It's very easy to make, reasonably quick, and tastes better than the crap from the grocery store.
Another fav of mine is what I call veggie soup. I use a bag of mixed veggies, 28oz can of whole or diced tomatoes (you crush the whole tomatoes while making the soup), 32oz chicken or beef broth, 0.5-1 lb chicken or roast beef, potatoes, and onions. Cook the chicken in the skillet as described above (I've not made it with beef). Get a big pot for the stove, or even better a crock pot. Slice up the potatoes to desired size. Put in the tomatoes, chicken/beef broth, potatoes, and cooked chicken & onion. Add some salt/pepper or whatever other spices to taste. Let it simmer for a while (I dunno, 30-60 minutes?), or just set the crock pot for whatever time frame you want it cooked in. You can obviously make this without the chicken, but it's just a good hearty soup that you can make a lot of at once and take for lunches.
Now don't forget the basics either:
Sandwiches (very cheap to make)
Bulk microwave meals (carefully read the nutrition info and be careful about eating lots of these in general - I like LeanPockets)
Chips, pretzels, popcorn, etc of some type
FRUIT!
Salads (Buy the larger containers of fresh, organic greens; buy some whole peppers and carrots to slice into salad; tear up sandwich meat for a little more 'meat' to the salad; bring salad dressing in a separate, small tupperware container)
If you're going to cook some of the stuff like I described above, or even do simple lunch-meat sandwiches, I highly recommend getting a Costco/Sam's membership. A lot of the ingredients for this stuff can be pricey if you make it regularly - we use a LOT of chicken. Sandwich meat too even, at least for the good stuff. We generally don't buy cheap ingredients for health and quality reasons.
Hope this helps, feel free to ask more questions!
