Hello Drew,
If you require any information on being a Resident/Nonresident I would suggest that you look at the Empassy's web sites of the country's you would like to visit, they do have sections on this matter.

Do you just want to visit these countries for three to four months at a time? or are you looking for employment in them? I am not up to date with the information that you are looking for, But I am sure that you will get the info if you check out the above.

Good Luck