I have some discoloration on my toenails but have no pain, what should I do or look out for?

Nail fungus. Have it checked out by a podiatrist. It may be a fungal nail infection. If so, there are treatment options available.
See a dermatologist. Fungus is 1 of several possible causes, mostly not serious.
Sounds like fungus. I would start using a topical antifungal on the nails. Watch for thickening and further nail discoloration.