I used to think in terms of conventional current but soon found that Electron Flow explained more to me. Certain electronics principles just don t make sense when you think in terms of conventional current. Most electronics text refer to Electron Flow and it just clicked for myself. A general term now used chiefly to signify the strength or value of a current. The symbol I for current comes from this word.
Resistors are non-polarized which simply means it doesn t matter which end goes where.
There will soon be a section describing polarization on the website. A FAQ on producing PCBs. This won't get you production-quality stuff, but it'll be fine for what you want. PCB layout hints I use 80mil by 55 mil pads for ICs. This gives a reasonable sized pad, and leaves enough room between for a fair-sized track.