Need some 'Lake Sem' HELP - LOCALS

I am going to be down to fish Big Sem for the FIRST time on the week of March 20th - 25th. I take one/two trips a year...was going to head to Lake Fork, but decided to face less traffic and try another lake for the first time.
Any guidance at all would be appreciated in terms of fishing/seasonal patterns on the lake. Will I be spawn - assuming already it will not be POST spawn. Lot of grass? Lot of structure (wood)? I have read it is a fairly shallow lake, and assuming I am going to find some grass for key bite.
I look forward to your replies, and will thank all those ahead of time for the information you share.
BallCoach