Lives of the Saints are good but you have to remember you are reading about Saints, people who were called to that life. A lot of the time converts will read about Saints and want to be like the Saints. That's not a bad thing, but you wont be able to live in a cave or sleep on rocks and eat only bread. Those Saints were called to that life by God and so God gave them the strength and ability to do those things. If you try that, you'll end up dead or hurting yourself.
Try reading books about people who are in the Church now. For example, Everyday Saints and Other Stories. The people in that book, lived great lives but they were also your everyday people, these books help you relate a little better. Than after that, by all means tackle the lives of Saints, just don't lead yourself into delusion and think you can be like these people without a blessing or calling.