Enlighten Me with My Concerns on Hosting my Blog in my Own Domain..Thanks!

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First of all, I hope that this post is allowed here... Fellow myloters, I need your help. I planned to host my blog to my own domain from blogspot. I am planning to get the 1and1 web hosting. Correct me if I am wrong but as far as I understand and what my friends told me, everything in my blog will remain the same except that I will have a new URL without the blogspot in it. My main concern is, I am into paid blogging right now like PPP, sponsoredreview and the like. I already submitted paid posts to them. So, if I am going to transfer my blog to my own domain, will the URL's of the paid posts I submitted will automatically be change or do I need to update the URL? If you could please walk me through this, I would appreciate it so very much. Please also share to me any disadvantage for doing this if there is. By the way, here's my blog URl http://www.mariesweetlullaby.blogspot.com. Thank you in advance!