Depends on the class, but very likely there will be. They are college classes. Expect homework, tests, midterms, final exams, possibly papers to write. But every class is different.
YES. This is very important to remember. These grades will follow you, so make sure you only do this if you feel you can do well.
I didn’t totally follow this, but keep in mind that college language classes usually cover A LOT more material than high school language classes and move at a faster pace. So college Spanish I will likely be much more challenging than high school Spanish I. You mention this class will be online? That may also be a concern - for many people, it is HARD to learn a language online. I would not consider this ideal.