96 chevy blazer transmission

there was never any sign or any reason to believe my tranny was going bad. i was driving it and it suddenly stopped moving as if in "N". no matter
what gear i put it in, it will not go. except when i first start it and it will go into gear "R" or "D" but only for about 20 seconds, then its like it is in "N" again. does anyone have any idea why? or have nay suggestions as to what to check or where to start checking. i am lost when it comes to transmission problems. thanks
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If it is full of fluid, then it is coming out and apart for repairs, based on your description.

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check the fluid
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