For a first time finisher a wipe in poky is going to be the way to go. It's simple to apply and pretty forgiving, in addition to not requiring any special gear.
Nothing wrong with the stuff you have now, although I'd skip the seal-a-cell, I can't see the benefit it would add under the poly. Application of a wipe on is pretty simple, you can either wet a rag with some and the literally wipe it on, or do with my personal favorite style of application and is to brush it on liberally, them wipe off the excess after a few minutes. Let the first coat dry, then apply 2 more in the same manner. Don't touch the piece with the sandpaper until you've wiped on 3 or 4 coats. Depending on how you want the finish to look, about 4 coats should give a more natural appearance,but personally I'd go with about 6 coats of wipe on