Sport Help me get on the right plan, please!

Sport Fitness
I'm 34, 5'10" and 140lbs. I've been skinny my whole life and not all that athletic. The only "fat" I have on me is a little belly that started a few years ago.
For health and vanity, I started working out a while ago. I want to lose the stomach and add muscle/tone everywhere. I want to know how much I should be eating (and what I should be eating), and if i'm training right or not.
I workout about 3 times a week. This consists of about 45 minutes of Machine weights followed by 30 minutes of an eliptical machine. I alternate doing upperbody one day and lower body the next, but I do the eliptical everytime.
I want to stick to using machine weights because it's just me at the gym and I wouldn't have any help/spotter to do free weights.
 
I forgot to add that for the weight training I do 3 sets of 10 reps at a weight that will force me to barely make number ten in each set. And I do the following:
Upper Body:
Biceps
Chest
Shoulders
Back
Triceps
Biceps again
Chest again

Lower Body:
Calf
Hamstrings
Squats
leg extensions
Cals again

I do situps every time.

Thanks
 
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