For driving mosfets you need to be concerned about the maximum current you draw from the output pin. The limit for the atmega328p in the Uno and many other Arduinos is 40mA per pin and 200mA total all pins. Mosfets have a high input capacitance, so to keep the peak current below 40mA when the output changes state, a series resistance of 100 ohms or more is connected between the output pin and the mosfet gate. If you are using an output pin to provide a continuous current for example, to drive a LED), then you should keep the current well below 40mA, for example design for 20mA or 25mA as the maximum.
If you want to drive ten mosfets from one pin, then you should use a 1K or greater series resistor per mosfet. Using a higher series resistor slows down the switching, but unless you are switching very large currents or increasing the PWM frequency from the Arduino usual value (around 500Hz), this should not matter.