ok to start with dont worry about all of the millions of details you can get stuck in with
counting
calories is great but burning them is better :P
you have a good weight to start with for your height so i wouldnt even bother looking at the scales anymore
make obvious improvements to your
diet, more veg, less processed foods, less coca cola etcetc
as for the exercise do something you enjoy, your home
gym sounds great, so use it!
personally i like to start with my
cardio, have a light jog or jump on that bike of yours and get your
body nice and warm, get your
heart rate up there and get a good sweat on
when ready move onto your
weights, pick a few
body parts as you have already and simply highlight them be sure not to work the agonist and antagonist on the same day as you will tire too much / it will effect your recover and the building of your muscle
for example dont work your biceps and triceps hard on the same day, working 1 also hits the other lightly
on a monday you could work your chest, shoulders and biceps with the
weights, finish of with sets of situps etc to strengthen your midright, i really rate
body weight
exercises for your core
tuesday could then be your legs, work that butt, your quads and hamstrings and wednesday back to upper
body but diff muscles and so on and so forth
above all enjoy it, everytime you come back see if you can improve little by little
on a final note, to see the definition in your
abs and other muscles you need a low
body fat % so keep that in mind
good
diet
good sleep
good exercise
thats all you need