NaeNae - I work full-time, and a slow cooker is brilliant. If you have issues with leaving them cooking all day, then you can get ones that are designed for camping and don't actually need to be plugged in (but need more time in the morning to get them going).

There's the "working mums" series and "after-dinner healthy" mini-cookbooks available at woolies (usually near the checkouts) which are great. Comfort food though is usually slow cooked (oven or SCer) but you can do soups etc easily, and a creamy polenta meal with tomato sauce or spaghetti & meatballs is also easy ...