Even though you only have written evidence, how under the Rules of Evidence will you get it admitted into the case? Most times you need witness testimony to authenticate and then to lay the foundation for the things to get admitted.
If you do not have a lawyer, I suggest you rethink your strategy if you desire success.
You need to disclose witnesses, documents, damage computations and liability insurance, if applicable. As others have commented, you may need a witness to authenticate a document so that it may be received into evidence unless you can convince the other side to stipulate to its authenticity. SEE Federal RUles of Civil Procedure 26(a)(1).