you probably should start with learning to model :P
importing models from other games/sources is highly, highly unadvisable since the face and vertex count on such models are probably sky high and would either not export, look bad ingame, or crash the second an instance of the model is created ingame. blocklands lack of reflectivity value adjustment on materials means that everything you make will always look like a hard, shiny model, making the look of the model at first will not match up with the model's look ingame
long story short: model your own things, not import them from elsewhere, or else it will look like stuff.
