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No, you don't have to. The grass will die off and help fertilize the flowers that you plant. This article should help you with starting your flower bed. https://www.gardeningknowhow.com/special/starting/how-to-build-a-flower-bed-starting-a-flower-bed-from-scratch.htm

chinese forget me not, annual babys breath,baby-blue eyes,candytuft,spurred snapdragons,five spot,balsam,dwarf columbine,yellow daisy,pansy,johnny jump up,coleus,tussock bellflower,and forget me not are a few to get you started with. All of these like full to partial sun and will only grow between 8''-24'' tall.

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No, it isn't normal typically. What plant are you referring to, as this would help us to better identify the issue.

How is the soil? It sounds as if the soil may be missing something. I would recommend having a soil test done to let you know more about the health of your soil and what nutrients may be missing. This will make it easier to correct and result in more healthier and vigorous growing plants.

Most grass in garden beds can be easily pulled up (though it may be time consuming) and followed with the addition of a 1/2" thick layer of (moist) newspaper topped with 2" mulch. You can also use a non-selective herbicide, such as glyphosate (Roundup), which has the potential to kill any plant on contact. However, with care this can be used as a spot spray in flower beds, avoiding contact with desirable plants. Don't do this on a windy day. If feasible, you might want to cover your candy tuft with trash bags while you spray, and for about half-an-hour after. It will dry rather quickly, kill the grass, and will not stay in the soil.