Hello and welcome to FF ! In general terms; there are many frogs that are suitable to begin with. If you like tree frogs, can't go wrong with a healthy White's. If toads attract you, any ground types will be OK. Aquatic frogs like ACFs and the smaller ADFs are easy to care for; myself keep a small Budgett called Princess. Even among the darts there are species suitable for a beginner. Just take your time deciding and ensure they come from healthy stock. Good luck !