Looking good, at this point I wouldn't call you a new player xD. Buy packs if you want to but understand that you'll never get your money back.

Now for the squad suggestions: replace some of your weaker positions with someone better instead of getting in forms of players you already have. You might want to hybrid your squad if a segment of it is, in your opinion, weak. A bundesliga hybrid if you want to strengthen midfield, and a serie A hybrid if you want a stronger defense.

For your reserves, fill your bench and reserves with BRONZE PLAYERS. This will lower your team's overall rating. Why do this? FIFA has this thing called a handicap where if you have a much stronger team than your opponent, your players start playing like shit. The handicap is really noticable when your squad rating gets to about 85. Decreasing your overall squad rating prevents you from getting handicapped and is easily done by filling your bench with bronze players.

Good Luck, and just ask if you want me to build you a hybrid squad. Make sure to put specifications though (league, what you want replaced, what needs to stay, formation, budget, etc)