Well, I would recommend one pinky for now....one thing you can do to kinda judge how it is going is feed him and see if he still has a lump after 24 hours. If he does, one pinky is probably perfect.
I would really, really recommend weighing him so that you don't over feed him......you don't want a regurge on your hands.
I follow the Munson Plan and I think it is easy and takes all the guess work and worring out of what to do!!
THE MUNSON PLAN
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-When they're on single pinks (2-3g), I feed every 5-6 days. (Snake = 4-15g)
-Double pinks (3g x 2) every 5-6 days. (Snake = 16-23g)
-Small fuzzies (5-7g) every 6-7 days. (Snake = 24-30g)
-Regular fuzzies (7-9g) every 6-7 days (Snake = 30-50g)
-Hoppers (9-12g) every 6-7 days (Snake = 51-90g)
-Weaned (14-20g) every 7 days (Snake = 91-170g)
-Adult (20-30g) every 7-x days (Snake = 170+) See below.
Note: Adult females are fed more frequently than adult males (especially following brumation). Adult females are fed every 7-12 days; adult males are fed every 11-14 days.
I would invest in a scale...I found mine at Target for $25!
Hope this helps!