You can start with audiobooks and audio material that also has a written transcription to follow. It is a good idea to start with a book that is at a level that is just a little above your understanding level. Starting with a higher-level or native level pace might be difficult to comprehend and can cause frustration. Try to listen to the book and read along aloud. This would help improve your pronunciation as well. As a learner of a new language, you may find it difficult to keep pace with the audio while reading which is fine. All you need to do is find a book that is just a little faster than your reading capability. This way you are forced to improve your pace.
Start with a story or a book that you are already familiar with and then move to the unknown terrains.
Keep it interesting.
Find content which is interesting to you. Everyone has a preferred genre to read. Check what interests you and choose accordingly. This is essential to continue learning. If the material is not of your interest, very likely you will drop it midway. As you become comfortable with the pace of audio, you can try to move on to higher-level or native speaker levels.
Find a native speaker to practice listening and speaking
Finding a native speaker who is interested in learning English or your native language through an online language exchange program can also be helpful. You can always request your companion to slow down or repeat something if you find it difficult to comprehend. This is a good option to practice listening and speaking both together.
Make good use of a class
If you have joined a class to learn Spanish, you can ensure that you speak with the other students in Spanish at every possible occasion. This is equally applicable to an online class if you are learning in a group. If you are learning in a one-to-one session where the teacher is a native Spanish speaker or has native-speaking level fluency, you can try to check if you can have some general conversations during the classes which can help you listen actively to the teacher as speaks on a topic.
You might have diligently learned everything that is taught in a Spanish class, however, making a conscious effort to listen actively to Spanish conversation is very important as this greatly influences your speaking ability as well.