Quote From rewt:
Every PhD is different and getting started is one of the hardest parts of a PhD. Before my PhD I had no research experience and was similarly lost but so was everyone else. Though I would suggest reading as much as you can. It doesn't need to be tailored but read whatever you find interesting or think is important so that you start building your wider knowledge. I personally think to many PhD students have no knowledge outside their niche area and getting a perspective of the wider field helps so much later on in your PhD. So just start reading without forcing it.