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Go hire an architect and let them arrange for you. The soil investigation needs to have instructions from a PE on what to do and this is not what a layman can scope out. topo survey needs to have cadastral map downloaded from SLA INLIS and additional plans purchased on INLIS as well so a QP will know what needs to be purchased and provided to the surveyor and the soil investigation team. I did both together for about 5K+ some years ago. Yours would likely cost more due to inflation as well as maybe additional holes need to be bored for the soil investigation due to bigger plot of land. Anyway below are the companies I used back then. soil investigation - ABV topo survey - CAK & FG Survey