Organic model kits
I bought my molecular model kit from Indigo Instruments. I think this set is much more user friendly than sets that are available in the ASU bookshop. It is also a lot cheaper. Either buy the set or you can buy just buy carbon atoms etc.
Model set that I like
I recommend using models for determining chirality (R and S).
Picturing Newman models.
Seeing cyclohexane ring flips.