Well done on getting your arse into gear. It's not easy, as most of us know.
You don't say if you've cut out the alcohol but, if not, then this is a good place to start.
You don't have to cut it out completely, but certainly try to limit yourself to either just having a drink at the weekend, or sticking to the recommended daily allowance. Also, if you're drinking lager/beer/wine, then these will be contributing massively to your daily calorie intake.
Don't go to the gym every day. You will become bored easily and lose motivation. Also, your body needs to recover from the previous days exercise, so I would recommend going every other day.
45 minutes should be all you need in the gym, providing you are doing the correct exercise and using the equipment correctly. Make sure you mix it up. I'd do 25 minutes cardio training, and then 20 minutes with weights.
Try not to weigh yourself any more than once a week, as it's easy to become disheartened when the scales tell you you've gained a pound or two. Remember, our weight fluctuates during the day, so weight yourself once a week, at the same time of day, and use digital scales.
With regards to the "three small meals", I would swap this for 'little and often'. Eat every three hours, and keep it small and healthy.. so graze. This will help your metabolism.
Lastly, do not give up! You're doing really well and will soon start seeing the results... though you'll have to wait a bit longer than a week, I'm afraid :)
There's a section on here, for weight loss. Have a look, it's really good and you'll be able to get tips and motivation from like-minded people.
Keep up the good work and good luck! :)