Nice hay - like from a riding stables or farm, rather than pet shop hay which is more suitable for bedding, or grass of course - and only a moderate amount of veg - very importantly don't give veg if they aren't used to eating it as it will upset their stomach - just give a tiny slice or square of new veg, and slowly increase the amount you give them every day for 2 weeks - and stop if they have an upset tum from it. They don't need a lot of veg - just a chunk of carrot, and a medium leaf of spring greens a day when they are used to eating small bits.