The proper course of filing the reply/written statement is, that since times immemorial, advocates have been following a certain trend. First of all, you have to scan his petition to find out exactly on what ground (s) he is relying to get his divorce. Next, there are certain objections (legal as well as factual), for which his petition may not be maintainable. You have to chalk out such grounds. In your reply, you have to give sub-heading - "Preliminary objections" and explain them point wise and para wise. Next, he must have concealed certain facts and which are relevant and which are going against him and going in your favour. In addition to this, there may be certain facts, which you want yourself to tell to the court and thosee facts may favour your case. Such facts have to be brought under the sub-heading : "Additional Facts". After the sub-headings-"preliminary objections" and "Additional Facts", now comes the final part with the subheading - "Reply on merits para-wise". Here, you have to reply to his petition para-wise, some facts which you may admit (for example, the factum of marriage, its place of occurence, marriage date etc.) and some facts you may require to vehemently deny. Finally, your prayer to the court and verification clause. The reply shall be supported by an affidavit.
Finally, at the time of filing the reply, a lady like you, who does not have financial resources either to survive or to contest the cast, there is Section 24 of Hindu Marriage Act, which provides maintenance during the pendency of the divorce case and also litigation expenses. This application you have to move along with the above said reply. The court will dispose this application at the first instance and you will be having money to contest the case with much vigour.
Wish you best of luck.