Two issues here - bleeds and separations.
Bleeds:
You haven't yet said what size page your document is set up to. Assuming it is also letter-size - and your printer can print up to letter-size - then there is no way you can print bleeds and crop marks as these will extend beyond the max paper size your printer can handle.
So in order to print bleeds, your document must be set up on a smaller size page than 8.5 x 11. After printing, you will have to trim down the paper so that the printing appears to bleed off the edge. You need to determine the minimum margins you must allow for your printer to pull the paper through. Draw a rectangle on a letter size page and fill with 5% grey (to use less ink/toner). Print it and see how much white border is left all the way round. It may not be equal, but at least you will know the unprintable margin size you must allow for.
Say for example, your printer can print to within 0.5" from the edge all the way round. All your designs must be within a 'box' of 7.5" x 10". You should allow around 0.25" for bleeds all around, so that the whole design must fit within a 'box' of 7" x 9.5", and you will need to trim off the 0.75" around all edges to give the appearance of bleed.
Separations:
You need to be printing to a postscript printer for the separation menu to be enabled.