Hello Mibro.
Congrats on doing a fish free cycle. Eiginh has you pretty well covered. If you're going to use fish food I suggest putting the food in a mesh bag (one's for filter media are great). That way it won't be such a mess in your substrate. Too, you could use a jumbo shrimp but it might take a little longer to decay compared to fish food.
If you're considering using Tetra Safe Start (TSS) fill the tank, treat it with the chemical of your choice (Prime is highly recommended) to remove the
chlorine. Wait 24 hours before adding the TSS. When you add the TSS you add the fish you want right away. Don't do any tests for 7 to 10 days and "no" water changes during this time either. Get the size bottle that best suits your tank volume. Use the entire bottle.
TSS can be difficult to find locally and may have to be ordered.
Best of luck and keep us posted.
Ken