@Kin Lay Below are answers to your questions. I recommend you chat with a CPA who can advise you how to best "shift" your income in order to maximize your earnings potential while minimizing your tax liabilities.
1. Yes, you can invest in both a 401K and the IRA at the same time. Deductions to an IRA get phased-out depending on your AGI (Adjusted Gross Income).
2. I am not so sure giving a money manager is the best approach for your 401k. I try to steer clients into the direction of investing in such a way where fees are reduced. Generally, that means index funds and/or ETFs that track a certain index. I think there is a place for investment advisors, but I generally do not recommend clients (especially younger people) give their money to an investment advisor until they have accumulated substantial wealth.
3. The 401k limit is $18,000 regardless of your earnings. There is a catch-up contribution ($6,000) available to those over the age of 50. As for the IRA, as I mentioned above, depending on your AGI, you might not get a tax deduction if investing in a Traditional IRA.
4. Yes, there certainly are. For one, consider a Roth IRA as it sounds like your income will only go up. Next, I would discuss with a CPA who can provide tailored advice unique to your situation.