I play both, Mobile is very simplified.
Transfers are slightly more unrealistic in mobile due to the player exchange feature working abit OP. I play as lazio and signed Elseid Hysaj one of the games best full backs for 10mil plus Strakosha, a mediocre GK.
Tactics can be tricky for brand new players but if you don't do anything ridiculous you should be fine. A good balance of duties (def/sup/att) when setting player roles is a must. Too many of one can imbalance your team.
I have found scouting to be awful. Compared to the full game it's a bastardisation. Just go onto the customisation page. Select a position and it gives you the best options for your team straight away. Knowledge of countries doesn't matter...........
Imho I would advise buying the full game on you pc/laptop.
Message me or reply on here if you want specifics, it's hard to just give general advice on such a big game.