If you have space to sow them indoors first you'll likely get a longer flowering season and better germination rate, it's a little on the earlier side to be sowing outdoors.
I try to reduce the number of annuals I grow year on year in favour of perennials (some tender, such as pelargoniums), due to cost and the never-ending nightmare of trying to protect stuff from slugs (I won't use slug killer).
As for "what", well you might just as well find a nursery or garden centre and pick what you like the look of.
A good pot full of annuals should have some plants trailing over the edge of the pot with a taller central plant of some kind, upright fuschia/geranium/dahlia etc., and medium height plants between the trailer and central plant. You will have to decide on the colour scheme, bold or quiet etc. For the best effect it would be better to buy plugs and plant the containers up under cover of a greenhouse or polytunnel. Now is about the time to sow annual seed indoors but obviously, they will be much later than bought in plugs.
I plant marigold seeds directly into pots. Then cover with some chicken wire to stop my cats from disturbing them. I always get a good success rate with marigolds and the seeds are a decent size so you can see where each one has been placed. I just push the end into the soil and then sprinkle a bit of vermiculite over the lot.
To see a world in a grain of sand and heaven in a wild flower Hold infinity in the palm of your hand and eternity in an hour.
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I try to reduce the number of annuals I grow year on year in favour of perennials (some tender, such as pelargoniums), due to cost and the never-ending nightmare of trying to protect stuff from slugs (I won't use slug killer).
As for "what", well you might just as well find a nursery or garden centre and pick what you like the look of.
I always get a good success rate with marigolds and the seeds are a decent size so you can see where each one has been placed. I just push the end into the soil and then sprinkle a bit of vermiculite over the lot.