which input I turn my components?

Projects General Guidance
5

I'm doing a project in college with Arduino. need to know what type of Arduino and which input I'll turn the components listed below:

motor(propeller) Dc x1
Servo Motor x1
Leds x3
Sonar sensor Tx and Rx (4 doubles, tx and Rx)
circuit board for electronic management of sonar x4
accelerometer x1

What I need to know is:

1 -) what type of Arduino is right for me? I've been researching the Mega 2560, Arduino UNO REV3 and MINI models.
ps: I need to put the arduino with these components on a boat, takes up less space as possible inside the boat, then if the arduino MIni work, it will be even better.

2 -) which and how many entries I'll use in Arduino (how many analog inputs and PWM inputs are necessary for each component)

Sorry , we don't work like that.
You need to state your project objective (what you are trying to do)
If you can't tell us that, we can't answer your question. It's that simple.