What can be the signs of early depression?

Low mood. Many including persistent low mood, sleep disturbances, lack of interest in activities, fatigue, irritability, hopelessness. Early treatment leads to the best success. Talk to a professional soon!
Signs of Depression. Difficulty concentrating, remembering details, and making decisions fatigue and decreased energy feelings of guilt, worthlessness, and/or helplessness feelings of hopelessness and/or pessimism insomnia, early-morning wakefulness, or excessive sleeping irritability, restlessness loss of interest in activities or hobbies once pleasurable, including sex overeating or appetite loss.

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What can I do to combat early signs of depression?

Ask for help. Talking to a good listener is important. Talking about or writing about your feelings really helps. Try to avoid treating yourself with alcohol or sleep pills. Keep busy, try to sleep well, eat healthy, and reasonable excercise. Depression is common and appropriate most of the time. The fact that you ask suggests your type will be easy to manage.