Oh btw- my advice is to start with cobs as said above. You WILL fuck up your first pipe. Just the way it is
true that, and cobs are still life savers, but do you care? i mean, i don't want you to ruin your first briar, burn the damn thing out. then again, if you are the kind of person who likes worn denim, broken in leather, a good chair that fits you better than anyone else, a little rim darkening (or even char) might make it feel that much more "yours". your call. i am all for caring for my tools, but they're mine first, and they're there to do a job.
3-in-1 tool: for tamping and cleaning the pipe, and possibly clearing the shank of blockages (i think? little metal rod but never did get used by me). the flattened circle is used to tamp down the ember upon first light, and adjust the ember and tobacco throughout the smoke. the spoony bit is for clearing ash and unsmoked tobacco (dottle) from the bowl.
straight versus bent: 80% aesthetic. straight pipes can often pass a pipe cleaner through the stem to the bowl, allowing cleaning during a smoke (if it gets wet), and full bent rarely can do this. but with cobs it's moot: the stems of cobs are too narrow to pass a lot of pipe cleaners anyway. also, some bend changes the center of gravity, making it easier (functionally lighter) to clench in the teeth during smoking, while straight stems can act heavier than they are. but mostly, your call.