Setting up Partnership

Hi people,

Someone contacted me via my themeforest email offering a partnership proposition, I will design template and he will convert them to wordpress, Both of us are in different countries.

Now I am asking how we can officially setup this partnership remotely?
What guideline we should take care of?
Any advises to me, in order not to regret in the future or getting cheated ?

Please help

Do they have approved items on the marketplace? That would be my absolute first check to avoid getting burnt or having your time wasted.

There’s more info here.