"and you shall rejoice": It is written here "rejoicing," and, elsewhere (27:7) "rejoicing." Just as the "rejoicing" there is with peace-offerings, so, the "rejoicing" here.
"in all to which you put your hands": In all to which you put your hands, I shall place blessing in it.
"whereby the L-rd your G-d has blessed you": all according to the blessing which comes (as "vows and gifts" [6]).
(Devarim 12:8) "You shall not do as all that we do here today": As long as the mishkan (the tabernacle) had not been established, the bamoth (individual altars) were permitted, and the (sacrificial) service was performed by the first-born. When the mishkan was established, the bamoth were forbidden and the service was performed by the Cohanim.