This is pretty random stream of thought. I've been managing my own investments for the past 20 years or so - started putting aside into RRSPs / Mutual Funds / Stocks when I was 19. I've done good and bad; here are my thoughts.
Low MERs are important - that's why I used to go for index funds, and now am in index ETFs. Index funds mirror the market - you pay the MER to the bank/investment co to manage your money. With very few exceptions, most money managers cost you money compared to index funds. Thus, high MERs = the bank gets rich, even if you don't.
But to start out:
If you have a regular income flow, I'd recommend pre-authorised debits to your investment acount. Probably, if you're starting out, to RRSPs, in a single mutual fund. Hold everything in your own name - the majority of advisors are honest, but if you find the one bad one in the bunch, you're in trouble.
So, automatic transfers. To start out, go with a generic balanced mutual fund. A mutual fund, by its nature, gives you some diversity. Don't get obsessive about spreading out investments at the beginning - frankly, until you're over 30K, the additional costs of multiple investments almost cancel out the benefits. It also gives you too much information to process for too little a return
Don't panic. Things go up, things go down - over time, you'll learn more and rebalance (bonds vs stocks, etc) - but if you start saving even $50 per month it adds up fast. Increase your savings when you get pay increases and it grows even faster.
Request DRIPs for all your investments. That's "Dividend Reinvestment Plans" - the dividends and payouts from your investments get rolled back into the investments.
Read up on investing - I like Moneysense magazine for broad topics (not detailed understandings and explanations, though). They have a "Lazy Man's Investment Portfolio" (or something like that); I'd argue that it's still to involved, but the theory - buy, hold, adjust no more than once a year - is sound.
Everyone on the Internet has an opinion. Many are shills, promoting their own investments. Be selective and careful.
Most important recommendatioon for the end: If you can't understand the investment, don't invest in it.