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Some entry level VNs are Grisaia no Kajitsu, Fate/Stay Night (Or any Type-Moon VN), or Clannad (or other Key titles). Or you can try the Steins;Gate VN, which I think is even available on Steam.
Be aware though that official English releases of VNs are almost always all ages or R-15 rated, so no sex scenes. Conversely, be aware that most pirates circulate the R-18 versions of VNs as the default version, so if you want something with the sex taken out make sure it's the all ages/R-15 version.
