Yes, this appears to be the first poster I ever saw advertising the film, IIRC from around early 1979. I suspect someone like Therin of Andor probably has good scans of it.
No, but a lot of magazines carried that ad as a back cover.
The logo on this poster was used with pics of the first press conference where TMP was announced. IIRC, it was a public reunion for Grace Lee Whitney, who was announced as joining the cast, and it was possibly the first announcement of Stephen Collins, since Persis Khambatta was already signed when the production was to be "In Thy Image" and "Phase II".