You can learn to speak Polish efficiently by learning the phrases and sentences used in day to day conversations. These Polish sentences are designed for beginner and early intermediate Polish language learners.
Many of them will be very useful for your first Skype conversations.
These five hundred Polish sentences (with audio, flashcards, and learning games) use the grammar and vocabulary needed in basic conversations. (There are also sentences in other languages.)
There are ten sentences in each unit. The first fifty units cover the present and past (mainly).