Ok being gluten free is much easier now than it used to be. Things will get easier and better once you get your head around it but iron deficiency and coeliac disease often go hand in hand.
If you eat things that are naturally gluten free it’s easier. I.E. meat, fish, potatoes, veg, garlic, herbs, rice, fruit, yogurt, cheese, nuts, eggs etc etc.
You can buy GF pasta, GF gravy, Gf teriyaki sauce, soy sauce etc.
I have recently been having GF oats and making my own overnight oats and Go Free cereal is really nice and tastes like crunchy nut.
In terms of snacks check out GF aisle in Sainsburys, M&S or Morrisons etc or wherever you usually shop. Also lots of foods are GF and not in the GF section i.e. certain sausages, certain crisp (check labels).
In terms of bread agree it is expensive and definitely not as nice as non GF bread. I don’t mind Warburtons (they look like squares) I keep it in the freezer to avoid wastage and take one out as I want it but eat much less bread these days.
Lots of groups on facebook with a wealth of information such as one called Coeliacs eat out too and Coeliacs for beginners etc.
Also I have recently discovered a few nice cafes locally that make lovely GF cakes and scones.
I have also intentionally lost weight recently just over a stone and still more to go.
Take Care OP