If you learned Simandl technique on upright try applying that to electric just to get yourself oriented with the notes.
half position 1st finger E string is an F (1st fret on bass guitar, second finger F# (second fret), 4th finger G (third fret) and so on. You can go up the fingerboard that way and when you reach thumb position, just don't use your thumb, use your first finger to fret the octave E.
notes on E string bass guitar
(fret:1 2 3 4 5 6 7 8 9 10 11 12)
note F F#G G# A A# B C C# D D# E
Gb Ab Bb Db Eb
the third line is the accidentals. hope this helps
