Good for you for wanting to create your own blends! What oils do you have?
Everyone swoons over a soap I recently made with lime, patchouli and vetiver, plus a bit of ylang ylang for smoothness. Cheaper lavender or clary sage, instead of ylang, even peppermint would also be good, and take the blend in an herbal direction.
Here are some tips that work for me:
1) Swirl bottle caps under your nose for interesting combinations, then start adding drops 1 to 1 in vials or small bottles, and adjust from there.
2) Leave the blend open to air for a few days to allow the volatile aromas to fade, as they would in soap.
3) When you're happy with the final blend, pass it under many noses for opinions. I always bow to the majority in deciding whether a blend is soapworthy... unless it's a blend for a special person, or just for me.
Jenny