It's up to the discretion of the bishop and the stake president. There is a good chance that you will be excommunicated for a year or so. More likely, they will just dis-fellowship you for a year. A year after that you will get your temple recommend back.

You will have to see the bishop one a week or once every two weeks for about an hour. You will have to make restitution by contacting all of those women and apologizing to them. They won't understand what you are talking about, of course. There may be other restitution you have to make, I dunno. Obviously, you have to stop watching the prons and stop choking your chicken, forever. If you do it again, then you have to start the process over.

If this is your old ward and they know who you are, then...I'm truly sorry. It will be difficult. You will sit in sacrament and you will feel everyone knows what you did. You will feel them all looking at you and judging you. It's the worst feeling in the world. You will feel almost unbearable shame and embarrassment. Prepare for a very rough time emotionally. By the way, you are going to need to confess to your future wife what happened. If you don't, your bishop might, I dunno. He may just pressure you into telling her. Think about it, is it fair to hide from her what you did? Jesus forgives...do people always forgive? I am not certain. This may impact your future marriage prospects.

Also keep in mind that the church believes fornication/adultery is almost as bad as murder. Depending on what happened during your mission, you may have to deal with that additional sin. So, this is a really big deal. Remember, you really have to be truly repentant. This means you have to feel really bad about what you have done. For example, do you feel great sorrow and cry almost daily? I am dead serious here. They are looking for a demonstration of "true repentance" over an extended period (months to years).

Look, I am not saying that this stuff is moral or even ok. I believe that once you prayed to Jesus and you felt truly sorry, then you were immediately forgiven for any sins you believe you committed. This is not what the church believes though. So, you're going to have to deal with that.

By the way, you will be asked to start paying tithing again no matter what the result of the disciplinary council is. You will have to have a calling and do your home teaching. When you're clean, this is great and easy, and lots of fun. Unicorns and rainbows. When you are dirty, like we are, it's going to really suck and will not be the same experience at all. Sharing the gospel when you have the weight of this on your shoulders will feel so difficult. In fact, I can't even bring myself to wear my garments because I feel so unworthy. I am not a "crier" and hadn't cried in 20 years. Now, I can scarcely talk to anyone in church without almost bursting into tears. It's truly horrible.