I have recently started my own portfolio of crypto coins and hope to build it up in the same way as you intend, £25 per week.
I have the usual suspects ETH, ETC, LTC as base currencies.
This week I added XRP and EOS, I will keep it small, with about 10 different coins and each week decide whether to keep or change my selections.
In for the long term, and looking forward to following your portfolio.