The answer to this question is very similar if it was a right-handed player asking it. Although the choice is slightly less extensive for a leftie, a left-handed beginner should still consider a few basic factors when selecting their first guitar.
Comfort is key, since holding a guitar will be quite awkward in the preliminary stages. Body contours, weight, neck profile, scale length and cutaways will make your playing experience a little more comfortable allowing you to settle into playing a lot easier.
Versatility is also important. Since you may not know what style of playing you are aiming for initially, a versatile guitar will enable you to explore different niches. A guitar that has both single coil and humbucking pickups will cover a wide range of sonic territory, allowing you to learn different styles of music and widening your knowledge.
Squier has always offered affordable left-handed models and a guitar that particularly ticks all of the aforementioned boxes is the Squier ‘70s Stratocaster HSS left-handed. Providing a comfortable playing experience alongside both single coil and humbucking pickups, this ‘70s Strat would be a fantastic guitar for those lefties wanting to dip their toes.