I still consider myself a newbie (been MB for about 7 months) but these are things I did that worked (or things I wish I had done sooner!) ...
1. Use a separate bank account. If it means starting out with a small balance, so be it. That way you know you aren't dipping into your family finances or whatever. And it is great to see your bank balance growing and knowing that it is just basically free money that you have "earned".
2. Get a separate e-mail account just for matched betting. This is essential in my opinion. You will need to sign up for notifications, e-mail alerts and special offers from bookies. You will get multiple e-mails a day from some. Keep them in a separate account, it is just easier all round.
3. Make up a password and username that you can use for multiple sites. Password-wise, use something that has e.g. a capital letter, a number and maybe a special character. Then you can use the same one for all your MB websites and you won't need to write it down or have multiple passwords for all the different sites.
4. Use oddsmonkey. Massive timesaver and worth every penny.
5. Keep track of your bets. Personally I use 2 spreadsheets - one to log the detail of my bets (I use the Team Profit Tracker for this) and one to keep a basic record of current bets/withdrawals/offers that I am waiting to complete - you could use a notebook if you prefer to write things down. But keep track. Once you get going, you will have multiple open bets/accas/bet clubs on the go and you need to keep on top of them.
6. Start simple, start slow. If you are starting with a small balance it will take time to build up a balance at the exchange so you can lay multiple bets at the same time. It doesn't matter, it isn't a race. Take your time. Patience is a virtue. Use your spare time waiting for bets to settle or withdrawals to appear in your bank account to swot up on the Team Profit videos and guides - it will be time well spent.
7. Enjoy the ride! Yes, you will eventually get gubbed. The first one hurts the most. But pick yourself up, dust yourself off and move on to the next opportunity.