Written Talaaq

Q: My husband and I have been experiencing marital problems for quite some time now with no resolve. As a result, I have written out 3 talaaqs and asked him to sign the paper on which I wrote the words : "I 'husbands full name' hereby give 'wifes full name' a talaaq." Only under the first one did he write his name but no signature acknowledging that all 3 are valid. Is this talaaq valid? If so, how many have been given, and also, what should my next course of action as wife be?