My wife she took my 4 kids 12 .10 .6 and 3. eight mounts ago.She is not let me meet them.She doesn't like if I ask to meet my kids.she send me divorce letter by lawyer.I need help what should I do.

Get an attorney very fast, file for vistition and get a court order that requires her to let you see them and have visits

You need to go to court and file the proper paper work and asked for joint custody of the kids.make sure you get a lawyer aS WELL