My first step for projects is always to make a detailed list of features. After that I go though and look for the challenging ones, try to figure those out before you even start. After that, use your list as a guide to go by for what to do.

As for where to start, start with the lowest level features. What do most of the other, more complicated features require? I would guess that would be the basic DB design, user system and basic image storing methods.

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