I've started a 3-times a week, 90 minute, muscle strength and toning (i guess you'd call it that

How long until i should start to see results, considering the exercise is broken down into 3 sections:
Arms
Chest/abs
Legs
and each is done with 2 1kg dumbells
also...what should i start seeing first, muscle definition or loss of fat first? Or do they go hand in hand with each other? i'm just wondering...hehe