The reti is great for positional and tactical possibilities. I would recommend first just playing it for yourself a few times in slow time controls and reviewing.
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To start with, learn the KIA and the main line Reti, which goes:
1. Nf3 d5 2. c4 dxc4 3.Qa4+ Bd7 4.Qxc4 when white has better control of the centre. Also, you could play 3. Na3.