You're definitely in the right place to get help. I would hop on your bike and start doing 30-40 minutes of that a day. Make sure you are going at a speed that gets your
heart rate up. When it comes to the free
weights... I'm not sure about how many repitions and how often to do those, but do about 3 sets of 15-20 repitions using your ab machine. I might recommend more, but since I don't know your
fitness level, I don't want you to get sore the first time. Just try that out and if the next day you have no soreness... do a couple more in each set.
When it comes to eating... obviously stick the healthier choices like fruits, veggies, whole grains, water instead of pop, lean meats, etc. Whether you choose to eat 6 meals a day or 3 meals a day doesn't really matter, just as long as you do eat and eat within your recommended
calories. Someone else would probably be better at telling you how many
calories you should be eating to stay healthy and lose weight... but I would guess if you ate 1800-2000
calories a day with riding your bike and working out then you would start to see some results.
Hope this helps ya! And good luck!