i have a pond with a couple sunfish and 15 small bass, i want them to get big. what would be the best forage for them?

Tilapia

By a couple sunfish, do you mean the population of sunfish is a couple or you have a couple species of sunfish?

Generally a combination of bluegill (at least 25:1 ratio of BG:LMB by number) and tilapia (50-100 lbs/acre) work well in Texas. Add at least daily feeding from an automatic feeder and your bluegill and tilapia production can easily double, which increases forage abundance and condition for your bass to eat. Harvest any bass that are less than at least 95% relative weight by two years post-stocking (https://www.aces.edu/blog/topics/fish-water/fish-relative-weight-calculator/). Keep the bass population low by harvesting under-performers and you'll have giants in a few years (assuming the pond has good water chemistry and about 30% of its area occupied by some type of cover/habitat).

Start with about ten pounds of Fathead minnows. After a short while, add about 500 3 inch bluegills.

To really do it right, get rid of unknowns, rotenone and start over.

It has like 3 or 4 medium sunfish total

Fathead minnows they reproduce several times a year.

NDL, what size is the pond?

This right here

My take: forget the fathead minnows. With 15 bass they will be gone before they even think about spawning. Instead add 10 pounds of Tilapia followed a month later by 500 3 inch bluegills. The Tilapia will begin spawning right away and take predation pressure off the bluegills. They wlll also keep your pond algae free and that is no small benefit.

Plus #1. This guy knows pond management!