I sell samples -0- nicotine samples. The VT store also has samples, but I don't think they are -0- Nic. Most vendors do not sell samples in -0- nicotine read the descriptions carefully. The best thing to do is just get the 5ml size from a vendor if offered. I would suggest going down to the E-Liquid review section for suggested vendors.
DIY is a good way to make flavors, but there are things you do not want to do. Flavorings for example, do not use just any flavoring. Some grocery store flavorings contain preservatives that are harmful if vaped. Some are oil base and can coat your lungs with an oily residue that can harm your lungs. Please be safe and do a lot of research before doing DIY liquids.