90% of the time it's best to go with normal punctuation, the same as you'd use in writing prose. If you google yourself up examples of your favorite poets, from Lewis Carrol to Jack Prelutsky, you'll find that this is what they tend to do. A period in the middle of a line is just fine, provided that the meter of your poem sounds good with the pause that such a period often implies -- and, if it doesn't, changing the punctuation is unlikely to help.
Personally, I am annoyed by missing punctuation, particularly when it causes me to have to go back a line or two to figure out where a sentence was supposed to end and where the line was supposed to continue on to the next line with the sentence resuming.
So, if you are writing in complete sentences (as most poets try to do most of the time) with clauses, etc., then punctuate them properly unless you have a specific reason not to.
The one area of some "controversy" --well, calll it differing opinions-- is whether to make the beginning of each line a capital letter, something that was done in days of yore almost routinely but which, at least in adult poetry, has grown less common and somewhat out of favor. I generally don't like doing it. The origin of the capital line beginning was mostly to make sure that the reader could clearly see where lines began, especially in written correspondence. People wrote poems to each other in letters, but it was a waste of paper to start a new line if there was white space left, so they'd keep writing across the page and they would capitalize the next "line" beginning to indicate where the line would break if paper were abundant and free. Sometimes books were printed in the same way.
With modern typesetting, though, I think the initiail cap is a distraction because it generally serves no function because the lines are visually distinct and clear. And sometimes it makes a reader stumble, not knowing if a new sentence is beginning (a problem that would be especially acute if the poem does not use periods to end sentences!).
Still, there are fine poets today who use initial caps, and fine ones who omit some punctuation. I can only tell you the mainstream, "default" view, which is to use punctuation and lower case and omit the obligatory capital letter for each line. But if you feel that you have written something that is clear and more effective with a different approach, then go for it.