You've already taken the best step for sandy soil by choosing T&M techniques. You need to build OM top down and that will take years. You start with an infiltration problem. Lime moves through sand quickly. On heavy clay it may take me over 3 tons per acre to initially amend my soil, but once I've applied it, it can easily be 5 years before I have to apply a low level (1 ton/ac) of maintenance lime to keep it adjusted. With very sandy soil that is acidic, some guys tell me they have to apply heavy lime with each planting.
Understanding your specific soil is the place to start. Folks in the middle with more loam can get away with more abuse to the soil and it recovers. Folks on more marginal soils need to be more cautious.
Thanks,
Jack