>>535537009
Basically you can start with any of them because all of them (except for maybe unlimited) have remasters. The romancing SaGa trilogy is a good starting point as well as the Saga frontier Duology, the game boy games (Saga/Final fantasy legend) which were the beginning of the series are decent but might pretty dated for obvious reasons, the 2nd and 3rd games in this trilogy got remade for the DS and is japan only but has already been fan translated. Romancing SaGa 2 has a remake as well but its basically a different game with different mechanics and such. Keep in mind most of the games are non linears and not on rails so you can explore and do whatever you want without railroaded into stuff due to narrative and such (only frontier 2 does that due to it actually being story driven but even then there is non linearity to it)

tl;dr: you can start with any game in the series, except for maybe unlimited since its mechanics are way more experimental than the series usually is