That will be up to you because that will depend on your skills.
If the market moves are not fast, two pairs will be good as you can monitor those pairs together.
But if the market moves fast and one coin shows good progress for up and down of the price, I think one pair is enough because if you try with the second pair, you can feel difficult to monitor the movements.
Unless you have high skills, you do not have to use two pairs at the same time because that will need more focus to analyze the movement.
Skills and experience would really vary because this would really be your foundation when it comes to trading and of course with having sufficient capital because double pairing is something needing with capital also
and handling out two at once is not really just the same when you are handling one plus this current condition or characteristics of the market where everything is unpredictable then its really important
that you should really know on what you are doing.
Its up on op's choice because its his money and as long he do able to handle those things up then its his choice.
We better suggest he do one pair to see how good his skills in trading are for a week.
If he can handling one pair without a problem, then he can try to analyze more to find which pair that looks good for him and start the next pair.
If that will not be a problem, he can carry on with that and continue to trade while he needs to see how good the result is after two weeks.
Maybe in this situation, he can try with two pairs as the market moves good but be careful because the market is still unpredictable.