Hi Serena, welcome on board!
Losing half your weight is a wonderful challenge for you and is going to make a great success story when you achieve your goal.
Imagine how achieving this goal will change your life and make you feel!
The keys for you are the same for all of us, making small lifestyle changes, sticking with them until they start working, become habits and get easier, and then build on them by changing other habits. And of course, getting help and support when you need it (like you're doing right now).
Some of us have a weekly weigh in (Thursday's) which you might like to get involved in. Our posts are in the 'Weigh in' section of this forum. Another useful section is the exercise section where we talk about what we're doing exercise wise.
I look forward to you achieving your weight loss goal and reading all about your journey.