I think beginner is the wrong term, the right kind of len's can send you to the top of the tree, it's all about percentages 90% equipment 10% creative when you need technology to give a helping hand.
When your creative with shots it's the other way round, spending money on the right len's will give you the encouragement to carry on, get it wrong and it will send you into ever decreasing circles as your shots are missed.
i bought a 100-400mm as i wanted the extra reach for air shows, which are held in daylight so f/4 was fine, in fact the lowest i have is a f/1.8 50mm but your working by 60 watt bulb with that, so not spending on f2.8 as it was not needed, i did push out the boat and paid a lot but it will give more back, in fact someone else pushed out the boat and payed full price, a excellent
second hand len's that is 4 months old and has been looked after.
Try to choose wisely and it will pay dividends and please think of spending to much as you can only get better, buy a under performing lens and it will be on e-bay before you know it.
Regards Mark.