The Hub merchants have some pretty decent hardware for sale, but since you're at the beginning, cost might be an issue... Really tho, even the 10mm pistol is enough to deal with those scorpions - if you wanna play it safe (=cheap
), you could always lure one or two of them near the edge of the map, and if they get too close for comfort, just exit via the map grid.
Or, depending on how much AGI (and thus, how many APs per round) you have, you could shoot once per round, then back off a bit. If done right, the scorpions never have enough action points to actually hit you after they've closed the distance.