Noob Question about Best Size & DPI for A Sized Posters

Evening All,

I just have a quick question, which has probably been asked before, but had a browse through previous posts and I couldn't see anything specific so thought it best to just ask.....

I have watched the video about uploading the image and it automatically gets re-sized to all the A sized prints (A0-A5), but when creating the image to be uploaded, what is everyone creating??

I was thinking about creating in A3 @ 3500 x 5000 px and 300 dpi, but when this is "upscaled" to an A0 sized poster would there not be a degrading of the quality?

I can create an A1 size @ 7000 x 9900 px and 300 dpi and the file size is around 40mb which I believe is well within the upload limits, would it be wise to do this for each image I upload?

What does everyone else do in this instance??

TIA

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