Dildos and lubricants
The major tip you should take into account when deciding to buy a dildo or any other penetrative sex toy is to zero in on lubricants, too.
It is because a dildo doesn't produce it's own lubrication like a real penis. And moreover, the majority of materials will not glide easily if not lubricated.
In addition, forget about the myth that a woman's natural lubrication is all she needs to experience pleasure. Most materials easily absorb your natural lubrication, so an unpleasant friction, painful penetration and even sores may appear.
Now that you've decided to buy a dildo, don't hesitate to purchase a lubricant as well.