first of all u need u understand the modulator portion. it consists of
1. Loop filter which is basically an integrator in discrete time ie z tranform so u need to know about z transfroms and then how to create a filter in z-domain
2. Quantizer which is basically is 1 bit comparator which can be implemented using sign block in Matlab Simulink
3. DAC which is again 1 bit in simple case
4. Clock which samples the input signal and the quantizer is also clocked with it
the output will be a bitstream of 1 and -1 then u can do decimation to get the high resolution output.
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read this paper "Behavioral modeling of switched-capacitor sigma-delta modulators "
It is a easy one to build a First order sigma delta modulator using Simulink.FOr the Integrator you can either use a delay integrator like you did or Non-delayed one .For the Quantizer you need to either use a Quantizer block from simulink(search for quantizer) and the output from the quantizer can be directly subtracted from the input .the quantizer can also be implemented by the Zero-crossing/sign detector block.The oversampling ratio is what needed to be selected in such a way that you get the required SNR .By the way what is your Input frequency and what SNDR are you trying to achieve .
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