Hello redwinonsundays (can I call ya red?
easier to type) and welcome to the forum.
Be sure to have a good read of the info, tools, tips and articles on the home
page as there really is some great advice there too.
Joining a gym, great start, and even better if you have at least some sessions with a personal trainer if you are unsure what to do and how to as they will point you in the right direction. Gyms can be a little daunting at first but you soon get into the swing of things.
If your energy levels are low you may want to look at your carbohydate intake as this is the body's energy food. Unless you are carbohydrate sensitive you should still be able to have a carb intake of up to 60% of your daily food and lose weight. But every body is different so you may need to experiment a bit with that to find out what works best for you. Some people's bodys don't react as well to that amount of carbs so try different things and see how you go. Also you are only 5 days in so it could be your body is getting used to the food shift if you have made very big changes.
Sing out if you need help with anything and I wish you every success on your weight loss journey.