The following publications cover the answer to your question:
1-LOCAL GOVERNMENT CLIMATE AND ENERGY STRATEGY GUIDES
Landfill Gas Energy
A Guide to Developing and Implementing
Greenhouse Gas Reduction Programs (see attached file).
2-Biogas for cooking and electricity
Table of Contents
Introduction
Feasibility of technology and operational necessities
Status of the technology and its future market potential
How the technology could contribute to socio-economic development and environmental protection
Climate
Financial requirements and costs
Clean Development Mechanism market status
References
Biogas is a gaseous mixture generated during anearobic digestion processes using waste water, solid waste (e.g. at landfills), organic waste, and other sources of biomass. Biogas can be upgraded to a level compatible with natural gas (‘green gas’) by cleaning (removal of H2S, ammonia and some hydrocarbons from the biogas) and by increasing its methane share (by removing the CO2). The resulting green gas can subsequently be delivered to the natural gas distribution grids. In developing countries, biogas could be an interesting energy option, in particular for those countries that rely heavily on traditional biomass for their energy needs.
concerning software I am using SIMBA#Biogas - dynamic bio-chemical simulation - and it works very well for agricultural substrates. You may always modify input parameters (some default values you may find in internet or run an analysis (e.g. Weender analysis to determine amount of proteins, carbohydrates and lipids)) to introduce the interesting wastes - I have never tried it, but there also need to be some literature on application of ADM1 for landfill wastes
concerning the methodology I would recommend VDI 4630 Standard (Written in German and in English): "Fermentation of organic materials: Characterization of the substrate, sampling, collection of material data, fermentation tests" - so summarizing you will find all necessary information (also sample preparation) how to run such a test in a profound, scientific, manner, to get really reliable results. Moreover, the equipment for batch tests is very well explained there -and it is constructed from a basic laboratory equipment