What is necessary to convert to Judaism may vary in detail from rabbi to rabbi, but a period of study is central to the conversion process. This study would not only familiarize the prospective convert with the basic beliefs and practices of Judaism, but it would also help him or her integrate into the actual community. I find it very important that the person do the studying (and the internal growing) while participating in the actual life of a Jewish community. This will allow many things to become second nature to the individual. Once this slowly happens it will be possible to assess how far the conversion has really gone. There is nothing miraculous here, simply an educational process that every rabbi needs to evaluate until his or her subjective criteria are met. Then there are of course ritual aspects to formalize matters which I would strongly encourage that they be done. In the Reform rabbinate the requirement of ritual bath and circumcision will vary from rabbi to rabbi.
Celebrate by reading the M'gillah, dressing in costume, performing "Purim-spiels," and so much more.
So you are going to a Passover Seder at someone's house? Wonderful! Here are some things to know before you go.