Hi Katie! Firstly, congratulations on having a go at Oils! If you havn't tried Oils before, there are a coupleof things to consider;
Conventional Oils can be a little odorous, because of the solvents and additives in the paint, but something like Sansodor (Low odour Thinners) can reduce this a little. The other drawback is the drying time of the conventional oils; it can take more than a week to dry, and the white is even slower drying.
Quick Drying Oils (based on Alkyd resins) do what they say on the tube, that is they dry quicker, and are perhaps a little less smelly.
Water Thinnable Oils may be the best ones to try first, as they have a couple of advantages over the first two;
They can be thinned with water and of course the brushes can also be cleaned with water, and so are almost odourless, and they tend to be faster drying than Conventional oils.
I would recommend that you try these first, and see where you go from there, but come back to me again if you want more information.
Very best wishes,
RSC Wigan / Warrington