well bro, 50mg/day of anavar would be a nice starting dosage, and bs is right, anavar by itself wouldn't be a great builder, it would yield some mild gains though. I would run some test with it at at least 250mg/week
As for the tabs, they come in 5mg, 10mg, 25mg, it is a rather expensive drug comparatively to others yes
what size tabs does your source carry?