The interplay with genealogy sources and research is critical to the success of using DNA in genealogy.
The DNA tests are sometimes sold by companies who sell subscriptions, on a monthly or yearly basis, to their research databases (ie: Ancestry, MyHeritage, etc). There are also many sites on the internet that are completely free and have excellent functionality.
For building a tree, there are two sites that utilize the 'one world' tree concept. They both have their strengths and weaknesses and I have my lines on both. My favorite for working with DNA is WikiTree.
Find your ancestors and build your branch into the One World Tree on WikiTree. www.wikitree.com Enter your DNA test was performed at xyz company and Gedmatch ID on Wikitree to link the test and the tree. If the most you have time for is just your direct ancestral line that will be sufficient. WikiTree is a one world tree concept where one human body appears once in the tree, a collaborative site. A big advantage at WikiTree is it will generate a tree of which lines could contribute to an X Match and also cue you to which of your ancestors have 'others' with tests that may well match to you. It enhances collaboration when utilized.
Find your ancestors and build your branch into the One World Tree on FamilySearch. www.familysearch.org
FamilySearch - One of the best free databases www.familysearch.org Register for a free account and use their resources.
FamilySearch Research Wiki - very helpful for learning about how to research in particular places. www.familysearch.org/wiki/en/Main_Page
Cyndi's List -outstanding series of pages with resources for nearly any genealogy question you will be able to think up. www.cyndislist.com
Chronicling America - Library of Congress -Early American newspapers digitized and searchable. ChroniclingAmerica.loc.gov
Find-A-Grave -Digital Memorials to graves worldwide. www.findagrave.com