If you are in career mode then you need science to unlock more parts, if you are in sandbox mode you get all the parts from the start. If you need to know how to get more science, see vids on youtube ... there are a few "tricks" to easily get science, at least to get you started. From one beginner to another .... I would go to youtube and watch some of Scott Manley's videos. He is my personal favorite ... besides he's Scottish. All true Scottsman are engineers ... all true engineers are Scottish! (IMHO) I hope this helps.