Usually the effects loop is located after the preamp and before the power amp.
With many 'time based' effects, such as modulation (chorus, flanger, phaser etc) and delay these tend to sound better coming after the preamp. Drive and compression effects are usually placed before the preamp, but this is really down to what suits your ears.
I'd try the compression and OD before the amp, ie Bass - Compression - OD - Amp and try the EQ in the effects loop.
I have seen that with Bass, some people use the compression last in the chain, so try swapping the two around to see what sounds the best to you.