Just my opinion after years of pouring plastics:
1. molds are fine, but how long will it take to tire of the same shape/ action/color/ size?
2. are the lures for yourself or others - assuming they would even use them?
3. do you have an area to store equipment (different softness, dyes, different molds and sizes of the same lure, glitter colors, etc,?
4. What fish will the lures be used to catch? Panfish will not usually hit large bass lures though the opposite is true for many lures. Where will they be used: type of cover and presentations: off bottom, swimming, cover, slow/finesse?
5. Are the designs you chose require an open-cavity mold (one flat side) or an injection 2-sided mold using a syringe, top down pours (2-sided)?
6. Will you reuse the plastic of lures you don't need anymore?

Microwave and a Pyrex cup are the basics needed to pour. The rest depends on the answers to the above questions.

As for myself, I have tons of plastics in storage for over 40 years and a few years ago I decided enough is enough! - molds that is. I still buy lures I find interesting - soft and hard, but would rather take a part of a soft plastic lure and melt it together with the part of another to form something unique. It's very exciting to find lures that catch many freshwater species that no one has ever produced. I've posted many examples on Crappie.com. Some place to start if not sure about mold produced plastics. Plus, some shapes I've bought and liked , I copy them in plastic of Paris.