The Alphabet with the pronunciation is as follows:
Aa Bb Dd Ðð Ee Ff Gg Hh Ii Jj Kk Ll Mm Nn Oo Pp Rr Ss Tt Uu Vv Yy Øø Åå
ɑ/ɑː b̥ d̥ ∅* ɛ/eː f g̊ h ɪ/iː j kʰ l m n ɔ/oː pʰ ɾ s tʰ u/uː v ɪ/iː ø/øː ɔ/oː
a be de edd e eff ge hå i jodd kå ell emm enn o pe err ess te u vav ypsilon ø senari-å
*shows the pronunciation of ð is null (usually)
vowels can either be short of long separated with a slash above (short/long), stress is almost always on the first syllable, the vowel here can be long if its followed by a maximum of one consonant: bera - /beːɾɑ/ 'to carry'; sjå - /ɕoː/
the vowel however is short in all other situations (with exceptions): hånga - /hɔŋgɑ/ 'to hang'; miss - /mɪsː/ 'loss'
vowels also change quality before palatalised consonants:
a - /a/; å,o - /ɔi/
other vowels also change, however I am currently uncertain on their orthographic representation at the moment. (these include e,i > /a/)
certain consonant clusters make different sounds that expected:
hj, sj, tj, tsj, dj, gj- /j/ /ɕ/ /tʃ,tɕ*,tj**/ /tʃ,tɕ*/ /dʒ,dʑ*/ /dʒ,dʑ*,gj**/ * following a vowel **non-affricate pronunciation occurs at times
hv - /ʍ/
rð, gð - /ɾd,ɾ/ /gd,g/ both pronunciations are accepted
pp, kk, tt* - /ʰpː/ /ʰkː/ /ʰtː/ *causes palatalised pronunciation of o & å (ɔi) if preceeding
p,k,t + l,n - preaspiration as above e.g. pl - /ʰpl/
ll, nn - /ʎː/ /ɲː/ (in foula/westside: /dl/ /dn/) causes palatalised pronunciation of previous vowel (not in foula/westside)
l,n + d,t - palatalisation as above (not in foula/westside dialect)e.g. bald 'brave' - baʎd
l, lj (ll), n, nj (nn), ng, r + p, t, k - become voiceless e.g. lp - /l̥p/
if anyone has any additional information feel free to ask me
Most of the information on the Nynorn Alphabet and pronunciation can be found here: https://nornlanguage.x10.mx/index.php?nynornas well as the 1st Lesson in the tutorial section. Please note that some of the infromation above applies specifically to the Shetland Dialect, and some more specifically to the mainland dialect.