Getting the filters up and running is your first priority. Don't rush yourself, take your time and get everything done you want done, Start your start up time when the filter is up and running, Not when you added water. 4-6 weeks after the filter is running you can start expecting the pond to cycle, sooner with bacteria additives longer if you do it natural and allow the fish to cycle the pond.
Plants, Start with marginal plants, These are the hardiest and will do the best in a new pond, floating plants next, Lilies last. Young lilies can survive but they can also shock like fish can, great thing about plants is that even if they get shock they will usually pull through and come on out once the pond settles,
Fish are by far the most easy living things to kill during start up, But they are needed for cycling the pond. If at all possible don't start by adding feeder fish, Start by adding a few inexpensive medium size fish. Far less chance you'll introduce a disease and somewhat larger fish are usually more hardy than those cheap little feeder fish. You have done such a good job of asking questions and getting good input before doing things to your pond, Keep it up! Getting good info before you do something out of line is going to make starting up the pond so much better. You have a good support group here following your build,
We will help you when that time comes too. May seem like it is taking a long time to get it all done and up and running like you want, but your going to have many years of enjoyment with your pond, taking your time and doing things right now will pay off many times over as the pond Matures.. Your doing good!