If you are itching to start gardening, I would buy a cheap propagator set with lights, a bag of seed compost, and sow seeds. Now is a very good time to do this, and it is easy and rewarding. Sow things like zinnias, marigolds, sweetpeas, nicotianas, Ricinus, basil, zea japonica (ornamental corn), Solenostemon (coleus), lobelia- you will have hundreds of plants to fill your flowerbeds while you plan your long term garden.
Summer bulbs and corms like dahlias and cannas can also be started now indoors, or in a few weeks outdoors.
Start shopping for your front door pots. What flowers do you like? Pelargoniums look great in terracotta pots, but terracotta would be too dry for petunias - plastic, resin or metal would be better. Some flowers (eg Californian poppies, nasturtiums) can be sown outside in pots after the last frosts, and will give you masses of flowers. In the meantime you could fill your pots with bulbs in the green, like daffodils and tulips. Or buy cheap packs of primroses for instant cheerfulness.
do you have access to a tap in your front garden? You will need water for those pots and flower beds, or you need to embrace an arid planting style.