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You just need the will to start blog and bit of browsing order to find the platform you will like and want to use for months hopefully years of your blogging career..
In PopUP widget you can choose to show your content in a classic widget, but additionally you can make a campaign that will get user email / subscribe them to newsletter, or promote special page/product.
migration is worth your hosting is just not providing the required service to sustain, or you are moving to HTTPS.