First time deadlifting did 100 for 3 awful form. 2 months later had got a bit stronger (basic gains) and managed 130 for 3 and 140 for 1, I sorted out my form and decided to start deadlifting once a week. In 6 months I went from 140 for 1 for 200 for 1 with belt and chalk sumo style, 180 for 5, 140 for 15. My conventional at the same time went from 130 for 1 to 190 for 1 without me training it at all, just doing singles now and then. I did heavy deadlifts on a friday and stiff legged deadlifts on a tuesday. I also did a lot of rows and deep squats which all contributed heavily.