Beginner in R - Step by step guide to random effects poisson regresion model

I am conducting a meta-analysis and wish to combine data from multiple studies reporting injury incidence. I know I need to complete a random effects poisson regression model, offset by exposure hours, with 3/4 covariates. But I don't know how to do this - so any help / step by step guides would be really helpful. Many thanks. Nicola

I haven't tried in R yet.