If that is too uncomfortable, serve and take the first opportunity to approach the net. Try to beat your opponent to the net, it gives your team the advantage. Before the match, discuss these tactics with your partner so you are on the same page. If you can't deal with the lob, you won't be very successful at the net. Your overhead will not improve by ignoring it, so practice hitting overheads often.
Physical conditioning is a necessity - sprints, sliding, crossovers, jumping rope, etc.
Work on developing fast feet. Go to a local tennis court and practice the various movements needed to be competitive. Coaches generally do not have the time needed to give lessons during practice because of the time limit and number of players who try out. It is highly recommended that the player have some private or group lessons with a local certified teaching professional, and participate in the summer Jefferson Junior Tennis League. Read and understand the rules of the game and scoring.