Enclosure ideas?

[Speedy_Tortoise]

I'm planning to fix a new indoor enclosure for my Russian tortoise in the summer. I've seen so many amazing enclosures on this forum! I plan on using a 50-gallon rubbermaid container, like this one:
http://storage-containers.hometownhardware.com/Rubbermaid/50_Gallon_Jumbo_Storage_Tote-s649260.html

It's about 3.5 ft by 2 ft. Is it big enough?
Also what substrate should I use and what lighting?

I'm pretty new to decorating enclosures, so i need some tips/ideas Thanks in advance!