only 10 amps? that will last you 5 weeks and it'll only start kicking in when you stop.
I wouldn't bother with gear. I'd def try and eat more food and put on weight naturally first. If you're only 135lbs at 5.11", then you're def not eating right at all.
You might put on a few pounds with gear, but will prob loose it after.
That beig said, if I were going to get some sust, then I'd do 2 amps a week for at leat 16 weeks. That comes up to 30+ amps... actually, I'd really do 3 amps a week

since it's sust.
Also, don't do deca after... if you're going to do deca, then do it with the sust. I think maybe you need to research this stuff a wee bit more before trying this out.