I agree with Dr. Sethiya. Priliminarily you should go for qualitative chemical examination using various chemical tests for various varieties of phytoconstituents which may be present in the plant. Afterwards on the basis of constituents present, you can select the solvents for TLC and can proceed for isolation studies also.
First test presence of secondary metabolites using standard methods then go for its its separation,identification & quantification using standard methods.