Try going for Greek style of worship, Olympians like that.
Altars can actually be very bare. Simply an image will suffice and white pillar candle. You will place bowls for libations during daily or weekly offeratory rituals.
The actual ritual is fairly simple, you create khernips water by praying over it in the name of the deity and plunging a lit stalk of rosemary into it. Then washing your hands and face in it and sprinkling over the offerings, altar, and space using the “Hekas Hekas Este Bebeloi” banishing formula. Then approaching the altar and lighting the white candle for Hestia. Give her a libation and a hymn. She is like Papa Legba in voodoo, she opens the way for the gods and gives stability to the ritual. She is always served first and last.
Then you burn some incense and say s hymn to Ares (my favorite Greek hymns are the Orphic hymns translated by Thomas Taylor). Pour out libations.
You can spend time in prayer or communion with the God.
Then you say a round of thanks and give Hestia more libations and snuff out her candle.
Food (cooked meats, beef is traditional, fruits, olives)
In Ares’ case, dragon’s blood would be appropriate
Be aware that red would never be used for Ares. The only color used for Olympians is white because of their celestial height. Red was used for Typhon, enemy of the gods. In Egyptian mythology, Set. And when the two were combined, Set-Typhon. Course, that’s traditional Greek religion.