Although one can give you a baseline to start with re Maintenance and fat loss calories, no one can tell you precisely how many calories you should be taking in for your best fat loss. This is something that you need to experiment with to find the right nutrition for you and your body re progress and results. You can start off with a baseline diet and go from there. No, sugar does NOT have to be avoided.
I recommend that you check out The 3 Keys to Fat Loss - it contains comprehensive advice and information re nutrition, supplementation, and training for effective and successful fat loss.
If you're not sure what to do after that, then do some more personal research and experimenting, or get yourself a professional trainer who can and will design you an individualized Nutrition Plan that is specific to you re your goals and needs.