You can see the space delimited Japanese sentences on the text books for 1st grader, however this is a special case, but we never put any spaces between successive words in the sentence.

I think it is not necessary, but I ever read Japanese sentence with a space to make foreign people understand it easily. ^^

You don't have to make any space if only they are not touched each other.

I think there should be a slight space but not that wide :)