Long before you even contemplate buying holsters, or carrying a concealed pistol, get some good pistol-shooting instruction.
"Compact" and other small-size pistols (like yours) are very, very difficult to shoot effectively, accurately, and well.*
In reality, small pistols are experts' tools, and not well suited to beginners. The level of skill they require of the user is high.
Pocket holsters are also experts' tools, unsuited to a beginner's ability. Outside-the-belt holsters serve beginners better.
Finding a good left-hand holster will not be easy: Your best choices will be from the custom-made-holster people, although Galco makes really good off-the-shelf stuff.
Don't forget to buy a stiff, strong, properly-made belt. It's just as important as the holster.
For Galco, click on: Galco holsters; Holsters; Gun holster, pistol holsters, western holsters, shoulder holsters, leather holster and Glock holsters
When you bring a gun of any kind onto a public range, it should be completely empty of ammunition. It would be best if even its magazines are empty.
Each gun should be in its own case or box.
Most ranges will not allow you to draw from the holster, so leave it at home.
Since you are brand-new at this, the very best thing you can do is to tell a range officer that you are a new shooter, and to ask for help and guidance.
As soon as you get settled into a shooting lane or onto a shooting bench, unpack a gun and open its action to prove that it is empty and incapable of being fired.
Let the range officer tell you what the preferred sequence of events is, on that particular range.
Then, listen for range-officer commands. Follow all directions promptly. The safety of others depends upon you.
*You will find that recoil is your worst problem. To beat recoil, remember to hold the pistol as tightly as you can, to keep your wrist and arm joints locked, and to calmly press the trigger while concentrating upon maintaining a good sight picture.
As a "leftie," you may find that your shots go low-right. Do not change the pistol's sights: the problem is you. It happens because you are not pressing the pistol's trigger straight back; instead, your trigger finger is pushing the gun down and to the right. It will take a lot of work to correct this.