1) Don't be lazy. Change your pro to match whatever position you play. Not everyone on the site is a goal scorer. You should't move your ST or CAM back and play CDM or any of the back line. Mold your player to the position you are currently playing. It literally takes a few seconds. 2) If you show up late, don't jump into a position that someone else was playing. This forces them to back out and change their guy. Plus, it's rude. They were there first. 3) Keep your size in mind. If you aren't going to be challenging for air balls, your guy needs to be shorter than 5'10''. Look at real life soccer players for examples. CBs should be the biggest guys on the team and still, you don't see a lot of JJ Watt sized guys play at the elite level. An athletic CB can easily make up for a few inches in height. Feel free to add more guys.