For first experiments, you'd probably want to dilute your oils to 10%; a good start will be bottles of 1 ml oil and 9 ml ethanol.
To create a long lasting perfume is mostly achieved by the selection of some good base notes. It's more or less the the heavy base molecules that provide this effect. However, top and middle notes will enhance the overall odor, act as blenders, provide lift and diffuseness. It's a rather complicated balancing act.
I like to create formulations exactly for that purpose: long lasting. Take a look at my formulations for some suggestions.
For concentrations of the oils compared to the amount of ethanol, (strength) please refer to this numbers, depending on creating an EDC, EDT or EDP.