Well, if ya' have heard the blues, leenia, then ya' kinda know what it's 'sposed to sound like... Now traditional blues is generally in 1-4-5... The 1 chord is where you wnat to sing the song... Let's say that is in G major... So the G chord becomes yer 1 chord... Then you just start counting down from G (ABCDEFGABCDEFG) which makes the 4 chord a C and the 5 chord a D... Song in A??? Then it's A-D-E...

Now that is basic beginners blues... That will get anyone started at least from the perspective of what chord is next...

Once that is imprinted then there are lots of variations like 4-1-4-1-5-4-1 which is how "Catfish Blues", "King Bee", "Hoochie Coochie Man", etc... Doesn't really matter what key you play it in the progression will remain the same... That the nice thing about the blues is that once you get it you can bounce around with various keys in finding where yer voice best works...

B~