Hollyhocks and glads are full sun but your columbine like shade and since they don't come up at the same time your going to have to plant some perennial bushes to provide cover for the columbine.
Also children love to pick
flowers which is going to mean damage to your
flowers unless you put up some kind of fence where they can't get to them.
Hollyhocks are biennial which means the first year you get foliage and the second year you get the
flowers and the third year you get nothing. So my suggestion for the
Hollyhocks is to plant half this year and half next year. And since they are the tallest and you want your space to be viewed from the street plant them closest to the house, then the glads.
The best way to stake the glads that I've found is to put four
flower stakes at each corner of their space and then make a grid with twine. The glads grow up within the grid and it keeps them upright without damaging roots by trying to stake them once they have sprouted.
Lavendar is hard to grow for me. I hope you have better luck with it.
The bulbs can be kept in a dark cool place until you are ready to plant them. If they begin putting up stocks then I would plant them asap.
Make sure you get a type of ornamental grass that will grow in the amount of sun you get in that area. And becareful some can be very aggressive and you don't want it to kill off your columbine.
If you are going to put in the columbine try to put them on the north side of a bush that is everygreen.