I think they need kitten food until 6/12 months. The food you give shpuld ideally be complete and at least 50% meat or fish.
Regarding cables, I had one cat who was a devil for chewing them. I was forever amazed he didn't electrocute himself. Wiping with undilute washing up liquied prevents it but you have to remember to do it every week.
Our girls have good quality food and the best quality. Having a cat is expensive and I hope you have factored that in: monthly I spend:
Vet scheme for vaccs, flea and dewormer and an annual check-up £35.
Insurance £49
Food: good quality wet (Lilys Scrumbles, Pets At Home high quality brand) they have 90 sachets/cans pcm. They also have Hills Science dry daily (a bag lasts about one month) £100
Feliway diffuser and spray (one is anxious) £15 to £20 pcm.
Pet feeder for about 15 visits a year: £25pcm
They have occasional Dreamies and Likelix is great if they need meds.
To look after two cats well costs about £230 pcm. And you have to take a bot of furniture scratching on the chin.
Pro-tem, you need to get them microchipped and neutered, factor in litter for the next six/7 months until you can let them out. Also a good quality, microchip cat flap.
I hope it goes well. I'm not persuaded you have properly thought this through.