Hello Bea and welcome to the forum.
If you are unsure where to start have a good read of everything on the home page
as there is plenty of advice, weightloss articles, tools and tips to help you get going on your journey. Also we can help you as much as we can right here in the forum, so feel free to join in wherever you are comfortable and don't be afraid to ask questions.
Losing 25kgs in 12 months is certainly achieveable and can be done at a nice slow and steady rate which is great for long term weight loss and can establish the lasting habits we all need to maintain for life.
It saddens me that you have 'fat and ugly' as part of your signature. You are working on the 'fat' part or you wouldn't be here and I don't believe for one moment that you are ugly. Perhaps you could focus on something about yourself that you really like for your signature such as 'proud Mum of one' or 'beautiful bride-to-be' or even a motivational quote that gets you fired up. These are just suggestions of course you can have there whatever you like and I am sure many of us on here have called ourselves the same thing at one time or another...I know I have. However, it is hard enough in this world being overweight without putting yourself down as well.
I wish you every success on your weightloss journey.