The first and most important factor to consider is your lifestyle. Look at it like this - could you have a baby with the lifestyle you currently have? The point I am trying to make is a cat is almost like a less needy baby. It needs feeding, playing with and babysitting (dependant on it's age). If you are in a position where you can spend time with your cat for a decent portion of your day, most days, then you are most likely in the clear. If you work five 8 hour shifts where you will be leaving your cat alone, maybe it isn't the best idea...unless you get two! 

Cats also want lots of love and attention from their human mum/dad.  Are you in a position to give them this? If you have a stressful or physically demanding job, will you be able to come home and spend time playing with your cat?

Lifestyle is one of the most important things to consider before getting any pet, especially a cat or a kitten!

I will tell you this from personal experience, but everybody is different. I have 3 female cats. They have a wet pouch of food in the morning, and a wet pouch of food in the evening. I also have a bowl of dry kibble down for the three of them to share if they become peckish throughout the day. A box of 40 wet pouches costs £12 where I am. When you do the maths, that works out that they eat 6 pouches a day, which means 36/40 pouches are gone in 6 days. So I get 4 boxes a month, working out at £60 a month. Plus the dry food, I get 2 bags at about £12 per bag. Plus any treats you want to get them. Plus any toys. Plus the initial costs of litter trays, water bowls, food bowls. Plus jabs and microchipping. It all adds up! 

if you're in a position to be able to provide all these things for your feline friends and remain financially stable, then you're all good!