I used the below books to understand the language and started to solve problems using perl.
Learning Perl, Intermediate Perl, Programming perl and advanced programming in perl(1st edition)
see book reviews section in perlmonks for the above books.(use search facility)
Why do you want to do certifications?. Is it your ambition or just wanted to do because it gives you recognition in-front of your employer?. I am just curious to know.
Because I too initially felt like doing a certification, but later I did only self-learning with the above books, along with help of this perlmonks.org. (my intention is not to discourage/divert you from pursuing certifications).
Now I am feeling confident enough to solve real time problems(and I am solving it in my company).
since you are new to perl, I stop here. waiting for updates from you.
-- In accordance with the prarabdha of each, the One whose function it is to ordain makes each to act. What will not happen will never happen, whatever effort one may put forth. And what will happen will not fail to happen, however much one may seek to prevent it. This is certain. The part of wisdom therefore is to stay quiet.