All good suggestions above. Anything with multiple vegetables, beans, lentils, chickpeas, quinoa &c. will be filling and you can eat a pleasingly large portion without feeling guilty. Also risotto, putting in a bit less rice than you might usually and adding loads of vegetables for bulk (baby sweetcorn, button mushrooms, asparagus, green beans, peas, whatever you fancy, plus shredded chicken?). I make a bolognese every couple of weeks, then eke it out another night by adding a tin of kidney beans, a tin of tomatoes and chilli flakes for an impromptu chilli with brown rice; that's pretty filling and healthy. Portobello mushrooms are very hearty as well; baked with some goat's cheese or feta, cherry tomatoes, maybe some pesto, and served with a wholemeal pitta. Casseroles: bung some chunks of lamb (doesn't matter if it's fatty as it will render if slow-cooked) into a big pan with vegetables (carrots? Beetroot? Potatoes or sweet potatoes, maybe some parsnips or swede – anything you like), cover with water or stock, bring to the boil and stick it in the oven on low (150C) with the lid on for two or three hours until you can cut the meat with a spoon. Serve with green vegetables or a big salad.
But also... Hopefully once you get started your appetite will decrease. You sort of do have to get used to feeling a bit hungry when you're trying to lose weight, I think. Or rather – not hungry, but to realise what it feels like when you're satisfied but not stuffed. I like having a plain yoghurt after dinner as the texture and flavour helps to put a "lid" on my appetite. Likewise a cup of tea or something. It's hard, but good luck – it gets easier.
Another slightly controversial tip is: cook adventurous stuff using ingredients that aren't necessarily your favourite. Not stuff you hate, obviously, but things that are good for you which you might not ordinarily choose (for me this is tofu). This wouldn't work for everyone and some people will think it is really stupid! But I like doing this as it means I eat it, enjoy it a moderate amount and it does me good, but I don't want to overeat it. And sometimes I discover I love it. But I've found it's quite a good way to educate both my palate and my awareness of my appetite; I could eat boxes of strawberry granola, but give me a portion of lentil dhal and I'll think yes, lovely, but now I've had enough.