1999acuracl

Ok lets start by saying i believe i know basics on what im gonna need to start the project im gonna be cheap just to get started and upgrade as i go ... gonna do the fmc even tho ive seen its not best but it will be temp hopefully ... my questions are just guidance on how to pick a turbo that will be best in my situation (non intercooled 5ish psi boost fmu) as i dont really comprehend the ar and trim numbers ? Its a auto f23 .... im very mechanically inclined and fabrication will be no issue just the technical side of things is what im learning as i have been reading alot for some time now .... any help is greatly appreciated

.50 A/R Compressor, .63A/R Turbine is this right?