You shouldn't really go above 100mg Ephedrine a day, so it's best to start out with smaller dosages and work your way up.
Your Ephedrine tablets' dosages are will determine how often to administer it during the day.
For instance, my tablets are 25mg each, therefore I'd take a maximum of 4 tablets a day.
With each Ephedrine tablet you should dose your caffeine in a 1:10 ratio. So for a 25mg tablet 200mg of caffeine is enough.
The max dosages for Yohimbine HCL/day are 0.2mg/kg bodyweight, so for you (100kg) that would be a max dosage of 20mg per day. Just divide this number by the doses of ephedrine and caffeine for the day.
I'd space out all the dosages by 3-4 hours (ephedrine has a half-life of 3-6 hours) and take your last dose by 4-5pm (depending on when you go to bed).
Example day (3 doses).
Ephedrine - 25/25/25
Caffeine - 200/200/200
Yohimbine - 5/5/5
Enjoy the fat loss