You first need either a CPA or a tax professional to prepare all the tax returns and comply with the required filings.
CPA should be able to get you through this entire mess. However, if things get complicated and you need to fight with the IRS over some issues than you may want to consider a tax attorney.
Let me know if you have any question.
Please note: This advice is provided with the understanding that all the relevant facts have been provided by you. Any change in facts might affect the advice given and hence may not be relied on in such cases. Nothing contained in this reply was intended or written to be used, can be used by any taxpayer, or may be relied upon or used by any taxpayer for the purposes of avoiding penalties that may be imposed on the taxpayer under the Internal Revenue Code of 1986, as amended.