Crafrisun its worth your time even if you sell it after because its worth a good cash, but you don’t actually need it… you can progress normaly without it and with icewall combo you will still be great dps on lvl 50 and 90 dungeon (assuming you pull off and doesn’t get interruped).
About plate vs cloth I haven’t answered because its realy personal, both are ok, early on I recomend you mix the best equipments you can get, you will get rokas robe on lvl 75~ quests so you can’t combo all plate without losing a lot of great stuff that comes from this robe.
I personaly ignore armor combinations and use Cloth Gloves (for mag amp), Rokas robe and everything else plate to get extra defense… this being said I also do not invest on armor mastery as it is costy AS HELL and gives very low benefit early on comparing to spending your money on better equipment, anvil +3/+4 on staff to get some extra dps and if you want get Ice pike at least to 20-30% dmg attribute because its realy strong o-o. But I would skip armor masterie until later in the game. (survival its not really much of a concern if you play well)
About staff vs rod… I go for staff because I want the extra dmg that staff brings, there’s a rod on 75 that gives 1 level on all cryomancer spells that sometimes makes me wanna change my mind about that xD, its up to you especialy if you like the Cryo shield that has a passive that works with your shield stats (I personaly don’t give a **** for cryo shield since I do not want to play pvp). On later levels there’s audra staff that allows you to go cryo 1 and get icewall enough for shards if you want to go cryo>kino>kino>kino this would be probabily be a an excelent opition, I have no idea on HOW to get an audra staff tho.