These sites will help your understanding of shotgun ballistics. Use the lead shot tables for your purposes.
The further away, the less energy for penetration and killing power.
The smaller pellet size the the faster energy is lost.
The smaller the shot size, the more pellets per ounce.
The further away the the pellets are further away from each other.
I think some of the posters delicately suggest a 20 gauge over a 410.
Here is some info from the Remington site.
410 3 inch 7 1/2 inch shot has 350 pellets per ounce and 11/16 ounce of shot= 238 pellets
20 gauge 2 3/4 inch 7/1/2 shot with 1 ounce 350 pellets
20 gauge 2 3/4 inch with 9 shot = 585 pellets.
In my opinion, you wold be better with a 20 gauge which will be more useful for you in the future.
Get a mentor the help you wing shoot.
Do not be afraid of recoil, a mentor will help you minimize its effects by proper gun mounting and grip
If you know someone in the community who reloads he may be able to load some light recoil rounds to get you started with small shot sixes.
Any how, that's my thoughts.