Personally, depending on your own language talent, some people will not be confused even if they learn several languages at the same time. In this case, I suggest you study as soon as possible. I began to learn French and Italian in the first semester, thinking that learning together can make progress together, but there will be preconceived situations like English, such as unconsciously explaining French with English characteristics. But German and French are not the same language family, which is different from Italian.

A French teacher said that "French can't be taught by yourself". I don't think it's all right, but I can learn from it. For example, you can learn from the classroom at the beginning, and then start self-study to a certain extent. Besides, French grammar is really complicated. If the foundation is not solid at first or there are loopholes in self-study, the influence will be great later.

As for textbooks, both foreign original textbooks and domestic textbooks can be used, because foreign textbooks will pay great attention to practical functions, while domestic textbooks will pay attention to laying a good foundation for grammar and written expression. Personally, I think the two textbooks are complementary and effective.

The foreign textbooks mainly include "Travel All over France", and the one we are learning now is called Alter Ego, which seems to have intensive reading, listening, reading and oral English, and it is very practical. The domestic textbook "French" published by Beijing Foreign Studies University is very classic and solid, but the materials and some expressions are a bit outdated. The French Course published by Peking University is very good, not as complicated, trivial and clear as the Beijing Foreign Studies University edition, but some grammars will not be explained so deeply.

I hope it helps you.