Wholesaling Direct mail approach

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Ok new to wholesaling and from my understanding you should take one approach and stick to it. I am thinkning that the best approach for me to start wholesaling would be direct mail. I feel like I will have the free time once i graduate college in May and only work 25 hours a week as a server and then take the time to establish a wholesaling business. I have one multi unit right now and am learning land-lording. My idea is to master direct mail. I believe it is a numbers game and the reason many people fail is they give up after the approach doesn't work the first few times. I plan to master a good letter to absentee landlords, and try to put some houses in contract. This is a numbers gain and I realize I have to play the percentages to get the right deals. Any advice? thanks