what do you think

i am about to put down my 10%deposit for 2 great blocks of land side by side in a new estate down the coast the lands are of good size <i think>one is 721 sq and the other 1020 they are the best two blocks in the whole estate,,,top of the hill facing the ocean,my idea is to build a house on the first one and than sell ,,to hopfully pay for most of the other one ,because i want to build for me ,in the future well when i can afford to sell my buisness ,and receive enough income from my other ip in syd and elsewhere,my qestion is am i just incuring more debits ,am i better off just holding the land and not build and sell when im ready because i would only be paying out for land rates which is only about 1300 a year for 1 ,because its off the plan settlment is not till june so i got time to shop for my loan ,and my 10%is going to come from a bond so i dont know ,im still learning so any imput is greatly appreceiated []also when buying off the plan what are the ++++ and— about it