That's awesome that you want to reestablish breastfeeding
.
One thing we tried was using the Medela Supplemental Nursing System (basically a bottle that hangs around your neck full of EBM or formula, with a tube that you tape to your nipple, and bubs then BF like normal but drinks milk from both breast and bottle at the same time IYGWIM). However, the reason we used it was because my milk never really came in and was using it to try to increase my supply as well as teach DS how to BF. So not sure if it would be useful for you, but you can read more about it and other alternatives to the bottle here.
Good luck!