Red Roses should be the first kind of flower that you should give to someone on your first date. If you really love them and seriously want to pursue a relationship with them, then this is the kind of flower that you should give on your date. Everyone knows what red Roses would mean, so it would be pretty obvious what your intentions are, if you are planning to give flowers to someone that you are going on a date with.
Another kind of flower that you can give on your first date is Lilacs. Lilacs mean innocent love, so it would be the perfect kind of flower to give someone especially on your first day with them. You could also try adding some Daisies with the Lilacs as well, since daisies also mean innocence. These are the different kinds of flowers that you can give someone if you are going on a first date with them. It could be a good idea to buy a bouquet of them if you are going on a date soon.
You could also try asking a florist, if you are interested in sending flowers to a date. The florist should be able to tell you which kind of flowers would be the best to send someone that you love or want to be in a relationship with. A florist would be able to suggest which kinds of flowers to send them. And the florist would even be able to arrange a flower bouquet that would appeal to your date as well.