1. For the list of ingredients:

* Consider using common seasonings such as soy sauce, vinegar, sesame oil, and chili oil to add flavor to your soba. These seasonings can be purchased conveniently at the supermarket or online.

* If you have some basic seasonings such as salt, sugar, pepper, etc., you can also use them with soba noodles to add flavor.

* Also, some fresh vegetables such as scallions, cilantro, green garlic, etc. can be used as a side dish to add flavor and nutritional value to soba noodles.

2. In terms of preparation steps:

* First of all, you can try to cook the soba noodles. During the cooking process, you can try some different amount of water and heat to get better texture and elasticity.

* Then, you can mix the cooked soba with appropriate seasonings. Generally, you can mix the soba noodles and seasonings well, or adjust the amount of seasonings according to your personal taste.

* If you want to add more flavor and nutritional value, you can add some chopped vegetables or fruits, such as carrots, cucumbers, eggs, etc., to the soba.

* Finally, you can put the mixed soba noodles into a bowl or plate and enjoy the delicious soba noodles.

Overall, even without seasoning, you can still create delicious soba by choosing different ingredients and adjusting the preparation steps.