A big pen is a good start.
It may also help to give them plenty of interesting stuff to scratch in (dead leaves in the fall, dirt and weeds and grass clippings in the summer, bales of straw or hay to pull apart, anything handy that they can scratch through.) Letting it build up in their run, so...
Most of the common domestic chicken breeds can be kept together, including roosters sharing a pen. The Indian Games from McMurray hatchery should be like most other breeds: keeping them together is fine most of the time.
Hatcheries tend to keep chickens in groups: multiple males and lots of...
If you are in the USA and buy the chicks from a hatchery, or if you buy from a store that gets them from a hatchery, then it should be fine to put Indian Game chicks with chicks of other breeds (males or females, should be fine either way.)
If you are in another country, I do not know whether...