If you assume a clean, interference-free, input signal, such as might be the case if this were an exercise for schoolwork, then perhaps you don't need to work too hard on the input filter and amplifier. The filter will exclude out of band energy. If you are only feeding a signal generator into this receiver such as one might do to demonstrate principals in a lab environment, then you really have no other signals to alias into the desired one, so a bandpass filter isn't really too important. The amplifier's job is mainly to lower the overall noise figure of the receiver and so increase the dynamic range by increasing sensitivity. Again, not really critical for a lab demonstration.
On the other hand, if this is supposed to be a practical design, then I hope you are calculating the noise floor of your A/D and determining from that how much gain you will need in the amplifier. In addition, you probably should consider including a bandpass filter both before and after the amplifier. The one before the amp serves to keep strong signals out of the system and avoid overload. The one after the amp helps with preventing out of band signals getting to the A/D and also knocks down the higher level broadband noise floor that is coming out of the amp, noise which could alias into your signal.
In a practical receiver there are many considerations. Dynamic range is always an important one. A practical dynamic range for an FM receiver might be 70 dB. So you either need to have an A/D that can handle that range, or you need to implement an AGC prior to the A/D.
What sampling rate are you considering?