Good advice to take a break before you begin training because you will really need to do your homework once underway.
Pay particular attention to the a/c systems because that will give meaning behind the company SOP's which brings me to the second point. Learn your SOP's inside out because they in themselves will teach you a large part of multi crew ops.
IFR if anything gets easier cos the gear is better an you have someone to help out..... Dont be put off by the bigger speeds and heights. Its essentially the same as what you are doing now only the numbers change. Most twin twin turbines work on a descent profile of 3miles per 1000ft so learn your 3x table. Assuming the a/c is pressurised: as long as you keep an eye on your profile on the way down its pretty hard to cock up (tho you still will at somepoint). The key is correcting it early.
Good Luck
