Hii!HI and welcome.
www.thetortoisetable.org.uk is a good guide to tort safe foods.
Amazon sells the tort lamps and tubes etc. If you don't already have one you will also need a reliable digital thermometer/hygrometer to keep an eye on their temps and humidity.
Please follow the advice you have been given about keeping 2 torts together it is very stressful for them both to be sharing a space. Even if they have up until now they will both be pretty miserable about it, and it will eventually end up with illness from a reduced immune system because of the stress, serious injury and even death.
They need to be separated asap with their own sets of lamps, gauges etc., then they will be much happier, healthier and active. They will eventually need a minimum 4 x 8 feet enclosure each. If that isn't possible it would be in their best interests to rehome one.
This is just one of many stories where keepers have ignored the advice and ended up with sick and injured torts and expensive vet bills.
This is a copy/paste of an article I wrote on my blog last year. I've seen several new keepers ask the question of whether they should get a 'friend' for their tortoise, and so rather than keeping on linking to my blog (which feels kinda self-promoting, which is not my intent), I am creating a...tortoiseforum.org
I love the website you recommended to me thank you! I also bought the digital thermometer, hygrometer, and a temp gun!
Thank you for your advice!