Hi
You could join us in the WLG for some good advice and support whilst you are trying. Checking in each week and logging your weight will help you keep an eye on whether a regular small loss is being achieved.
Also as well as food, remember exercise is equally important to lose weight, but the exercise should be consistent, rather than hit and miss - eg 5 days a week 1/2 hour walk with 2 rest days built in.
It is also a good idea to do measurements as often a loss isn't seen but you may be trimmer (this has happened to me through exercise).
With regards to weight loss diet, I have been on a course recently which suggests a small dinner plate with half the plate filled with veg, 1/4 with protein and 1/4 with carbs e.g new potato, wholewheat pasta or brown rice.
I hope this helps. Remember though everyone is different so it really is about finding what works for you. Have you cut out all the empty food - eg sweets, icecream, biscuits, sugary drinks? That is where i would start first. Then think portion sizes.