they should all have dates on them. if your on the other side of the calander as you seem to be saying just flip the dates around 6 months as says in my grow guide (its in my sig)
indicas are fast finishers whilst the sativa dominant strains will take longer to mature and flower.
the sativa dominants will give you more of an uplifting energetic high whilst indica will give you the stoned medicated feeling. a good mix is recommended for something in beetween
(the banks normally explain the stoneds too otherwise use the indica sativa high as your guide).
i personally say stay away from ruderalis genetics which will instantly cross out anything autoflowering/early flowering, lowriders etc. from on my list. the genetics in these are rather unstable and imho not a good choice, especially if you plan on making your own seeds
.
from which fdd has a nice tutorial arround
anyhoo hope this helps
j88