You can eat more than one shake, one meal and one snack with 1500cals, you just have to think about what food you choose.
Use MyFitnessPal or Nutracheck to record your meals for a week (don’t think about dieting, but try to eat nutritious, unprocessed, filling foods). You’ll soon learn which foods fill you up and are satisfying, and which foods leave you hungry or desperate for more. It will also show you what’s a reasonable portion of rice, pasta, etc.
I calorie counted about 6 years ago to lose three stone (the first two stone fell off quickly, maybe in 6-8weeks….the last stone took a few extra months) and have kept it off. I don’t count now, but I have kept lots of the habits I formed.
Within the 1200-1500 restriction, I tended to have some porridge and fruit, eggs, or yoghurt and fruit for breakfast. For lunch, either something like a tuna or egg salad with a vinegar state or a smaller, leftover portion of the meal I’d had the night before; then I would cook in the evening. I found that a meal made up of a wholegrain and a protein, with loads of veg and lots of spices for flavour kept me interested. Anna Jones and Rukmini Ayer are two chefs I really like that do pretty balanced meals with interesting ingredients. Sometimes I had calories leftover for chocolate or crisps in the evening and sometimes I’d have a nice, fruity ice lolly.
Finally, exercise. It took me a while to get into exercising properly because it’s hard if you’re not used to it, but it’s really worth pushing yourself to get your heart rate up and getting properly sweaty (if physically able to). Walking does very little to affect my weight, but HIIT, running and cycling really trimmed me down (and keeps my weight on track even though I no longer calorie count or diet). If you use MFP or Nutracheck and a smartwatch, you can track how many calories you’ve burned working out and that gives you a good indication of what is most effective. I prefer cycling to running, but for me, a half hour run burns more than an hour cycle, so if I’m pushed for time, I’ll just go for a run and get it over with.
Good luck - you can do it!