Which mutual fund should I select for my first investment

I am a 19 yo student and was thinking of starting an sip of 1000 rs. from my pocket money. I was thinking about the Motilal Oswal large and midcap growth fund direct which is one of the top funds in the category giving the highest returns but here are some of the isssues to be considered- 1. It has very low holdings compared to the average -33 holdings with top 5 amounting to 37% of funds 2. It has comparatively higher level of midcap funds accounting to those higher returns compared to the category average 3. Its shifting more towards the midcap and smallcap recently Is this the right approach or should I invest more or should I split it between different funds such that the risk is lowered or should I consider a different mf altogether. I have already invested around 7000 on ITC and ITC hotels a few days ago. While ITC hotels is at break even, ITC is falling and the quarterly results are also due today. Should I hold?